How To Use Ventral In A Sentence
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There is no suggestion of a pronounced twist in the ventral margin of the jaw of Hynerpeton like that seen in Densignathus.
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Ribs are straight or slightly biconcave and fade on the ventral surface where they merge into the lateral keel.
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Their bodies are not distinctly segmented, but an important feature of their anatomy is the carapace, a folded shell-like structure which covers the animal and opens both ventrally and posteriorly.
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If the ventral curvature of tail is real, then that, in concert with its extremely narrow scaupulae, suggests that a more appropriate functional analog would be found in arboreal chameleons.
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In contrast, a strongly obtuse apical angle is associated with an incurved ventral beak that is appressed to the dorsal umbo, resulting in the delthyrium being partly obscured.
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The medial stripe, nearest the midline, which becomes the ventral region of the neural tube, gives rise to motor neurons, whereas the lateral stripes give rise to interneurons and sensory neurons.
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IAI and Cyclone Aviation Products Ltd in Carmiel manufacture the ventral fins, rudders, horizontal stabilisers and engine access doors.
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Hippocampus severnsi is distinguished from congeners in having a combination of: extremely small size (height 13 mm, standard length 15 mm); 12 trunk rings; 27 tail rings; reduced ossification of inferior and ventral trunk ridges; 14 dorsal fin rays; 10 pectoral fin rays; anal fin small or absent; medium length snout which lacks a bulbous tip; raised, angular coronet; single gill opening on midline directly behind coronet supported by raised cleithral bone; scattered tubercles on trunk and tail; predominant colour dark brown (sometimes slightly marbled) with large, bright red patch covering dorsolateral surfaces of trunk rings 1-4; tiny white dots scattered all over; pale posterior section of tail with dark transverse bands.
Practical Fishkeeping news (RSS)
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Cauda long, flexed ventrally in arch("U" shape), its tip not extending below the margin of the ostium.
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The first ventral arm plate is pentagonal with the lateral edges raised forming a boundary lip to the second oral tentacle pores.
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The lateral leaves of somatopleure then grow round on each side, and, meeting on the ventral aspect of the allantois, enclose the vitelline duct and vessels, together with a part of the extra-embryonic celom; the latter is ultimately obliterated.
I. Embryology. 11. Development of the Fetal Membranes and Placenta
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Once the snout contacted an ant larva or pupa, the snake would slide the ventral surface of its snout over the top of the prey until the prey item was positioned at or near the front of the mouth.
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The biventral lobule is triangular in shape; its apex points backward, and is joined by the gray band to the pyramid.
IX. Neurology. 4a. The Hind-brain or Rhombencephalon
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To handle the extra power at high altitude, the Columbia 400 incorporates a larger rudder in both chord and span, along with a ventral fin beneath the empennage.
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As the bird lands and decelerates the weight of the pectoralis and sternocoricoideus muscles causes the sternum to swing ventrally, increasing the volume of the thorax.
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Behind the pilot sits a standard astromech droid, plugged into an abbreviated, ventrally-fed socket which requires the droid to compress slightly in order to fit within the vessel's curves.
Naboo N-1 Starfighter | Papercraft Paradise | PaperCrafts | Paper Models | Card Models
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These commarginal lirae broadly tongue dorsally across plicae and ventrally across interspaces.
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However, a very key interneuron in Melibe resides in the pedal ganglion, as is the case in both of the parapodial flappers, Aplysia and Clione, but neither of the dorsal-ventral swimmers.
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They have a ventral nerve cord and a dorsally located heart which pumps blood through an open circulation system.
Insecta (Aquatic)
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The ventral and posterior margins form an acute angle of 70°, which offers an acuminate aspect.
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The inflorescence consists of spikes, solitary, digitate or fascicled, articulate and fragile; the joints of the floral axis and the pedicels of the pedicelled spikelets are trigonous and hollowed ventrally.
A Handbook of Some South Indian Grasses
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Copulation consists of the male wrapping the posterior part of his body around the female's ventral side, bringing his uropods in close proximity to her marsupium.
Crustacea
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In lancelets, the trunk somites extend and fuse ventrally to give the unsegmented periviscelar coelom.
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Leaves sometimes distichous, vertically oriented, transversely or subtransversely inserted, but with ventral base succubous and sometimes decurrent, constantly 2-lobed to 0.1-0.6 their length.
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The jaw is deepest in the adductor fossa region and shallow anteriorly as a result of a pronounced medially-directed twist of the ventral margin such that the splenial is exposed ventrally and mesially.
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The incomplete squamosals also slope laterally and ventrally away from the parietals, slightly depressing posterior margin of the supratemporal fenestrae.
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The positive allometry in both groups suggests that larger species loaded their jaws more heavily, because deeper jaws are much stronger in resisting loads applied dorsoventrally, as during jaw closure.
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Collembola: an ordinal term applied to species which are apterous; have no metamorphoses; have variably developed abdominal saltatorial appendages and a peculiar ventral tube at base: the spring-tails.
Explanation of Terms Used in Entomology
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The shape of the elongated spiky dorsal fin is reflected in the sweep of the flowing ventral fins.
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The important feature in this case is the membranous pad-like structure closely applied to the ventral surface of each of the ungues.
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This reduces the importance of the stapes in supporting the braincase ventrally.
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View larger image » An omphalocele is a birth defect known as a ventral wall defect, which involves the abdominal (belly) area of the fetus.
Omphalocele
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the liver is somewhat ventral in position
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Most praying mantids have a single midline ear in the ventral metathorax.
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The ventral surface of the pouch is covered by grooved blubber, on which the 50-90 grooves extend from the jaw tips to as far posteriorly as the umbilicus.
Archive 2006-10-01
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Advance has been along two lines, markedly in relation to insect-pollination, one of which has culminated in the hypogynous epipetalous bicarpellate forms with dorsiventral often large and loosely arranged flowers such as occur in Scrophulariaceae, and the other in the epigynous bicarpellate small-flowered families of which the Compositae represent the most elaborate type.
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
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These muscles are arranged as a series of parallel muscle fibers from the lateral edge of the dorsal tergite to the ventral sternite.
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The ventral lobe in different species may be simple, bifurcate, or even trifurcate.
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Varied with a few whitish cross bands; last series of scales and beneath whitish ventral shield black in front; subcaudal plates, one-rowed; throat scaly; chin shields two pairs; eyes lateral, pupil round; front pair of frontal plates short; nostrils lateral, in two small shields, loreal shields none; one large anterior, and two moderate posterior ocular shields; lower temporal shield in the labial ones.
Journals of Two Expeditions of Discovery in North-West and Western Australia, Volume 2
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Spemann then transplanted the anterior lip of the blastopore of an embryo into the ventral side of another embryo it grew a new brain and spinal cord.
Physiology or Medicine 1935 - Presentation Speech
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Activation of dopamine D 2 like receptors is known to inhibit the activity of dopaminergic neurons in the ventral tegmental area of the brain.
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Bear in mind that this rule applies even in the case of extreme digitigrade organisms in which a ‘ventral’ or ‘plantar’ view of the ankle in a natural life position requires one to look down on the tarsals and see the top side of the foot.
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In galloping, the epaxial and hypaxial muscles function to produce dorsoventral bending of the vertebral column, and muscles fire bilaterally and uniphasically.
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Notice the brood pouches on the ventral surfaces of depicted males.
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The adult plumage of penguins is blue-black or gray dorsally (back) and white ventrally (front).
Penguins
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The flocculus is a prominent, irregular lobule, situated in front of the biventral lobule, between it and the middle cerebellar peduncle.
IX. Neurology. 4a. The Hind-brain or Rhombencephalon
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I always correct my primatology students to use the term ventral-dorsal when they refer to the more usual animal mating position: doggy style.
Observation: Gorillas Mate Face-To-Face
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Crustaceans have developed a complex tripartite brain and paired, ganglionated ventral nerve cords.
Crustacea
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During the visits to S. vaginatum flowers, portions of pollen, identified by its bright orange color, adhered to the head and on the ventral thorax of the syrphids, as well as (but to a lesser extent) to their legs and ventral abdomen.
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They form a shallow chamber on the ventral surface of the thorax called a marsupium.
Crustacea
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The articulation for the third metatarsal forms a somewhat rounded triangle (without the missing ventral end) and is cupped.
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The proximal half of the ventral surface forms a long depression.
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At approximately the seventh week of gestation, the ventral and dorsal buds fuse.
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Diagram of the four secondary germinal layers, transverse section through the metazoic embryo: Figure 1.74 of an annelid, Figure 1.75 of a vermalian. a primitive gut, dd ventral glandular layer, df ventral fibre-layer, hm skin-fibre-layer, hs skin-sense-layer, u beginning of the rudimentary kidneys, n beginning of the nerve-plates.)
The Evolution of Man — Volume 1
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So, for example, the tetrapod splenial developed a medially-directed twist of the ventral margin, exposing the splenial ventrally and mesially.
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Opposing this hinge axis is the ventral commissure.
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The dorsal and ventral edges of the centra are more nearly equal in width in the larger specimens.
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The sturgeon tail behaves mechanically as an extremely flexible sheet with flexible dorsal and ventral lobes following the central tail region.
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If pelvises are present, compare: the male pelvic girdle will have wider ischio-pubic ramus, while the female will have a defined ventral crest, a curved subpubic concavity, & a wide sciatic notch.
Mordicai: crown me king!
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Ventral valve with broad shallow sulcus bearing anteriorly a low and rounded median swelling; lateral slopes narrow, steeply inclined.
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The apex of the maxillary palpus expands ventrally into a flexible pad.
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At the end of gastrulation, the epidermis only covers the dorsal region and the ventral region is bare.
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The first caudal vertebra is identified as the most anterior vertebra that has paired haemal flanges extending along the ventral surface of the centrum.
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In wild-type hermaphrodites, germ cells at the dorsoventral flexure exit the pachytene stage of the first meiotic prophase and proceed to diakinesis.
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A short, faint horizontal ridge occurs ventral to the depression and slightly anterior to the maxillary root of the zygoma.
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the ray has a dorsoventrally flattened body
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Adult shells of both C. syringothyriformis and species of Regelia are large with alate cardinal extremities and large nearly catacline ventral interareas.
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Two muscles are key to dorsoventral expansion of the buccal cavity, which characterizes the expansive phase of a suction-feeding event in zebrafish larvae.
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In the polypetalous forms progression from hypogyny to epigyny is generally recognized, and where dorsiventrality with insect-pollination has been established, a dominant group has been developed as in the Leguminosae.
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
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A typical maize leaf can be divided along three axes, the proximodistal, mediolateral, and dorsiventral or ad/abaxial.
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The mature sutures display three or four discrete first-order subdivisions on the ventral flank of each prong and second-order subdivisions are common in external sutures of large specimens.
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On the ventral surface of the skull, there is a deep pit on each side of the rear of the palate.
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An intact, though distorted gastral array is visible on the medial surface of the ventral abdominal wall (
PLoS ONE Alerts: New Articles
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The first is the ventral tegmental which is the body's central refinery for dopamine.
Times, Sunday Times
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By conceiving a gradually increasing amount of yolk in the hypoblastic cells in the ventral side of the archenteron, the substantial identity of the gastrula stage in the three types, which at first appear so strikingly different, will be perceived.
Text Book of Biology, Part 1: Vertebrata
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In the reptiles (tortoises and crocodiles) a later dorsal part is joined to this earlier ventral part of the rudimentary diaphragm, a pair of subvertebral muscles rising from the vertebral column and being added as "columns" to the transverse partition.
The Evolution of Man — Volume 2
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The interspaces increase in width from dorsal to ventral.
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He suddenly discovered that his was the cut and that it was on the ventral surface of the penis corresponding to the primitive subincision operation.
The Journal of Abnormal Psychology
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The most obvious of these is the long calcaneal heel or calcaneal tuber, which projects proximo-ventrally from the proximal end of the calcaneum.
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Many whales are alive today, and they swim by dorsoventral undulation of their tail flukes.
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This shows the astragalus and cuboid of Rodhocetus in dorsal, lateral and ventral views.
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The proximal ventral arm plates are approximately trapezoidal with a wide convex distal edge, they are contiguous with one another at least proximally.
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The dorsal arm spines are the longest nearly two arm segments in length, the ventral arm spines are much shorter.
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During early stage of somitogenesis, mtmr8 expression was detected in both somitic mesodem and ventral mesoderm.
BioMed Central - Latest articles
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If either of these proteins is absent, then the motor axons select dorsal and ventral pathways randomly.
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The tectospinal fasciculus which comprises the major part of the ventral longitudinal bundle passes down through the tegmentum and reticular formation of the pons and medulla oblongata ventral to the medial longitudinal bundle.
IX. Neurology. 1F. Pathways from the Brain to the Spinal Cord
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The ventral interradial areas are also covered with spinelets although the extent and density of covering varies.
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It is not settled whether the back of a cuttle-fish answers to the dorsal or ventral surface of a gasteropod.
Thomas Henry Huxley; A Sketch Of His Life And Work
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Anostracans are sexually dimorphic; the males have a pair of ventral penes on their genital segments, while the females have a ventral, medial brood pouch to hold their eggs.
Crustacea
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They differ from Botocudo and most other antillocorines by the presence of all trichobothria of the fifth abdominal sternite located anterior to the spiracle of the same segment, fore femora incrassate and armed ventrally with spines in both sexes, and the males with a large distally curved spine at the base of the fore femur.
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the ventral aspect of the human body
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With the rapid elongation of the embryo and the formation of the tail fold, the body stalk comes to lie on the ventral surface of the embryo (Figs. 27 and 28), where its mesoderm blends with that of the yolk-sac and the vitelline duct.
I. Embryology. 11. Development of the Fetal Membranes and Placenta
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Adult plumage is blue-black or gray dorsally and white ventrally, sometimes with distinctive coloring or plumes on the head.
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Furthermore, the vomer is widest near its middle and its edges are downturned to create a troughed ventral surface.
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The trochlear nerve nuclei are located ventral to the mesencephalic aqueduct.
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The lateral leaves of somatopleure then grow round on each side, and, meeting on the ventral aspect of the allantois, enclose the vitelline duct and vessels, together with a part of the extra-embryonic celom; the latter is ultimately obliterated.
I. Embryology. 11. Development of the Fetal Membranes and Placenta
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The nervous system consists of a lobed dorsal brain and ventral nerve cord with fused paired ganglia.
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Swimming results from alternate dorsal and ventral flexions of two symmetrical wing-like parapodia.
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Ventral epidermal cells secrete a segmentally repeating pattern of small hooks, called denticles, separated by expanses of naked cuticle.
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On the other hand, the body-cavity, quite distinct from the gut and closed externally, has nothing to do with digestion; it encloses the gut itself and its glandular appendages, and also contains the sexual products and a certain amount of blood or lymph, a fluid that is transuded through the ventral wall.
The Evolution of Man — Volume 1
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Anteriorly, the ventral surface of the vomer is narrow and ventrally convex.
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The ventral paratenon consists of fatty mesenteric-like areolar tissue that is rich in blood vessels that nourish the tendon.
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Muscles necessary for the rapid dorsoventral expansion of the head are composed primarily of fast-twitch fibers while those involved in more tonic contractions such as hyoid protraction have more slow-twitch muscle fibers.
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The nuclei are desynchronized along the dorsoventral axis with chromosome bridges.
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-- The lumbosacral plexus results substantially from the union of the ventral branches of the last three lumbar and the first two sacral nerves, but it derives a small root from the third lumbar nerve also.
Lameness of the Horse Veterinary Practitioners' Series, No. 1
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Once the snout contacted an ant larva or pupa, the snake would slide the ventral surface of its snout over the top of the prey until the prey item was positioned at or near the front of the mouth.
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The perikarya of the unpaired ventral nerve cord are distributed over almost the entire length of a trunk segment.
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The ventral arm plates are pentagonal with an acute proximal angle, a slightly indented distal edge, and separated from one another.
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Respiratory circuit function recorded in the ventral respiratory group is particularly susceptible to hyperthermic stress.
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The ventral follicle cells produce proteins, like pipe, that are only deposited in the ventral vitelline envelope.
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Close to the sides of the thyroid are seen two large blood vessels, _ar_, the mandibular arches, which unite into the single ventral aorta just caudad to the posterior end of the thyroid.
Development of the Digestive Canal of the American Alligator
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Details of development not expected, the concept of the liver and spleen developing in the ventral and dorsal mesogastria respectively is adequate.
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Diagnostic characters: The peristome is a narrow furrow which begins, as a rule, close to the anterior end and runs backward along the ventral side, to the mouth, which is usually placed between the middle of the body and the posterior end.
Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901
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As a result we find cystic destruction ventrally and residual fibrosis mostly ventral lung areas.
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Santanghuia has resupinate shells, a semicircular outline, a catacline ventral interarea and the delicate ornament of Chonostrophiella, however, the internal dorsal anderidium arrangement of Santanghuia is highly distinctive.
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The conch is thickly discoidal, with broadly convex sides and rounded venter with rounded ventral shoulders.
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The ventral striatum is linked to motivation and reward.
Times, Sunday Times
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In the ventral part, the costae are bi- or trifurcated.
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It pumps blood forward through a big central artery called the ventral aorta.
THE GREATEST SHOW ON EARTH
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* In tetrapods with two-headed ribs, the more ventral rib head contacts a facet on the vertebra known as the parapophysis (plural parapophyses), while the more dorsal rib head contacts a facet known as the diapophysis (plural diapophyses).
Archive 2006-07-01
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Superficially, mysidaceans look much like small shrimp, and since they have a ventral marsupium, they are often called opossum shrimp.
Crustacea
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In these cases the shoot system is often more or less dorsiventral, and the sexual organs are borne on short lateral branches (e.g. _Thuidium tamariscinum_).
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria"
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The terms anterior or ventral, and posterior or dorsal, are employed to indicate the relation of parts to the front or back of the body or limbs, and the terms superior or cephalic, and inferior or caudal, to indicate the relative levels of different structures; structures nearer to or farther from the median plane are referred to as medial or lateral respectively.
Introduction
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Adults are dorso-ventrally flattened but unlike other flatworms possess is an anterior, suckered head region called a scolex for attachment to their host.
Platyhelminthes
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Bird penile tissue, where it exists, also develops on the ventral cloacal wall.
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Ventral arm spins may be slightly flattened and in some the arm spine may be curved.
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The lesser omentum is formed, as indicated above, by a thinning of the mesoderm or ventral mesogastrium, which attaches the stomach and duodenum to the anterior abdominal wall.
XI. Splanchnology. 2. The Digestive Apparatus
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Impact of acute inflammation on spinal motoneuron synaptic plasticity following ventral root avulsion
BioMed Central - Latest articles
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The color stream in blue, is also called the ventral stream or the “what” stream.
The Two-Streams Hypothesis
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In the thoracic region, the myotome has grown ventrally to meet the ventral edge of the dermatome, the cells have become spindle shaped.
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This ensures functional ventral expansion of the buccal cavity.
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By the growth of the liver the ventral mesogastrium is divided into two parts, of which the anterior forms the falciform and coronary ligaments, and the posterior the lesser omentum.
XI. Splanchnology. 2i. The Liver
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The ventral part of shell of a turtle or tortoise.
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In the male, the genital tubercle is located adjacent to and caudal to the umbilicus, whereas the genital tubercle in the female is located just ventral to the tail.
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Merrill identified and located various types of bulbar respiratory neurons and identified the dorsal and ventral groups.
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A complicating factor is uncertainty surrounding the choice of axisymmetric exhaust nozzle geometry and ventral strakes in the long term.
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Near the base of the pedicel, the transverse process projects lateroventrally.
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The waves continue coupled to a series of dorsal and ventral flexions of the whole body.
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The sheath of thin bony plates extends beyond the head to form spines dorsally and ventrally.
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Insects have a ventral nerve cord and a dorsally located heart which pumps blood through an open circulation system.
Crustacea
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Grain is oblong, obtusely trigonous, or concavo-convex, red-brown and rugulose on the ventral side.
A Handbook of Some South Indian Grasses
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The main assumption was that the neural or blastoporal surface must be homologous throughout the Metazoa, though it was dorsal in the Chordata, ventral in the Annelida and Arthropoda.
Form and Function A Contribution to the History of Animal Morphology
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The supraoccipital contacts the parietals of the skull table dorsally and the exoccipitals ventrally.
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The ventral lobe is divided into two deep bifid prongs by a high median saddle.
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This pattern, like the pattern of the dermal bones and the pattern of the scutes and bones of the plastron (ventral shell) is remarkably consistent across all turtles, particularly extant forms.
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Body cylindrical, scales small; ventral shields brown, rounded; tail rather short, tapering; subcaudal plates two, round.
Journals of Two Expeditions of Discovery in North-West and Western Australia, Volume 2
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The somatopleure, which is close to the ectoderm, is involved in the formation of the lateral and ventral walls of the embryo.
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Primitively, the ventral articulation is directly below the dorsal articulation and both are located above the anterior part of the vestibular fontanelle.
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These effects have been suggested to be involved in depression of the excitability of the vagal sensory axons and the dopaminergic neuron in the ventral tegmental area of the brain.
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There was some restoration of cuticular structures, including ventral denticles (arrow).
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The ventral keel is partially broken, but is observed to vanish near the middle of the ventral surface of the vertebra.
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Male swordtails in the genus Xiphophorus display a conspicuous ventral elongation of the caudal fin, the sword, which arose through sexual selection due to female preference.
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Burke interpreted the ventral sclerite as being solely comprised of the sternite fused with the coxae.
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The inset shows ELAV-positive cells within the clone in the ventral eye.
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The downwardly curved petiole twists away from the wind, so its ventral surface points downwind.
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Scutes over the limbs are termed appendicular scutes, and scutes forming the ventral portion of the carapace are referred to as ventral scutes.
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While the ventral face of the centrum generally is covered with an undulating pattern of faint ridges, the lateral surfaces are more or less smooth.
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The primate ventral prefrontal cortex contains two densely interconnected subregions: a lateral/orbital cortex processing primarily sensory/exteroceptive information, and a ventromedial cortex processing primarily visceroappetitive/interoceptive information.
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The older second leaf becomes dorsiventral to the first.
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Moreover, the auxiliary spines project from the ventral spines at approximately the same angle.
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The sheath of thin bony plates extends beyond the head to form spines dorsally and ventrally.
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Antheridia formed on the dorsal and ventral surfaces of the wing, while archegonia formed on the ventral surface of the anterior cushion.
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There are five branchia [l] arches, made up pharyngo -, epi - and cerato-branchials, and the ventral elements fuse in the middle line to form a common plate of cartilage.
Text Book of Biology, Part 1: Vertebrata
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The hypohyal is a ventral element of the hyoid arch which links the ceratohyal and the basihyal.
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When embryos are exposed to UV irradiation on the vegetal hemisphere they are completely ventralized and form no dorsal structures.
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The dorsal siphuncles of the Clymeniida tend to be larger than the ventral siphuncles of other ammonoid clades.
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A secondary glomerulus is formed ventral to each of these, and the complete group constitutes the pronephros.
XI. Splanchnology. 3. The Urogenital Apparatus
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The small cephalic lobe bore four eyes and five tentacles; each body-segment had on each side at the margin a tuft of simple setae directed obliquely upwards, and at some distance from this, upon the ventral surface, a group of thicker setae with a strongly uncinate bidentate apex.
Facts and Arguments for Darwin
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Dermal sculpturing on the surangular is confined to the area ventral to the oral sulcus; dorsal to the sulcus, the surangular is smooth and unsculptured.
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The ventral slit is a vent on the obverse side which is neater, transforming the jumper from a tight crew-neck to a comfier V-neck.
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(double), laterally on head, on shoulder (cleithral) ring, bordering throat, and on superior trunk ridge; spines also present on lateral and ventral angles between trunk ridges and rings; spines on superior ridge of first and second trunk rings appear externally as if they are fused.
Practical Fishkeeping news (RSS)
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The basiventrals form distinct elements that articulate with the pleural ribs in primitive teleosts, and thus act as parapophyses.
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It will be interesting to see whether the mutations which delete the midline structures, the ventral portion of the neuroectoderm and head in Drosophila, such as spitz and others (75), are homologous to the fish midline genes.
Nobel Lecture The Identification Of Genes Controlling Development In Flies And Fishes
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Myogenesis in the paraxial muscles (dorsal compartment) is dependent on contact with the neural tube and notochord, while limb and abdominal muscles (ventral compartment) are not.
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Other mutations affect the dorsoventral subdivision of the somites by the horizontal myoseptum.
Nobel Lecture The Identification Of Genes Controlling Development In Flies And Fishes
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Total RNA derived from dorsal and ventral skin was reverse transcribed using random hexamer primers and MMLV-reverse transcriptase.
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They differ from Eurytholia sclerites in having marginal and ventral accretion of the lamellate shell, in their bilateral symmetry, dorsal ornament of ribs and ridges, and shell folded under a posterior apex.
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Although appearing very different, these movements might be related to the invagination of mesodermal and endodermal anlagen, and ventral condensation and extension of the germ band in the Drosophila embryo.
Nobel Lecture The Identification Of Genes Controlling Development In Flies And Fishes
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Such a wasp held the fly with the middle and hind legs head forward and ventral or dorsal side up.
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Grain is oblong, obtusely trigonous, or concavo-convex, red-brown and rugulose on the ventral side.
A Handbook of Some South Indian Grasses
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Outwardly indistinguishable from other ammonoids, clymeniids are distinguished internally by their dorsal siphuncle, contrasted to a ventral siphuncle in almost all other ammonoids.
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In ventral view, the sphenorbital fissure, which is long and oval, is exposed posteriorly and is separated from the relatively small optic foramen by a narrow bony splint.
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Melanin pigment, associated with melanocytes, is more typically leptomeningeal based, particularly in the ventral medulla and cervical spinal cord regions.
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Partial intersegmental division exists on the dorsal surface; the ventral surface has a rounded protuberance on its anterior proximal margin.
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In snakes and amphisbaenians M. iliocostalis has its origin from either a tendon (most squamates) or a tendonous sheet arising from the anteroventral half of M. longissimus dorsi.
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The shell is strongly inequivalve, the ventral valve being convex and the dorsal one only slightly arched, except for the fold, resulting in an almost opercular aspect.
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The conch is thickly discoidal, with broadly convex sides and rounded venter with rounded ventral shoulders.
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Of the surfaces, onethe future flexor surface of the limbis directed ventrally; the other, the extensor surface, dorsally; one border, the preaxial, looks forward toward the cephalic end of the embryo, and the other, the postaxial, backward toward the caudal end.
I. Embryology. 12. The Branchial Region
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Ventral muscle field strongly impressed, elevated, cordate, with high ridges laterally and anteriorly.
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Transverse sections through the pons show that it consists of two parts - the basilar, or ventral pons, and the dorsally located pontine tegmentum.
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Just outside each vertebra, the dorsal and ventral roots unite to form a spinal nerve on each side.
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The hard ticks are flattened dorsoventrally in the unfed state, possess a marginal outline which tapers toward the anterior, and the mouthparts are clearly visible.
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A shallow fossa is occasionally found on the ventral surface of the basilar portion anterior to the pharyngeal tubercle, which has been interpreted as a vestige of the canal of the notochord.
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Some polychaetes such as the sea mouse Aphrodite aculeate also bear a ventral muscular, creeping sole; myzostomids have a circular body with fused parapodia, which also forms a ventral foot like structure.
Down with phyla! (episode II) - The Panda's Thumb
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Therefore, in larger shells, only the latest built ligamental chevrons and the ventral ends of the older ones remain functional.
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These characters would have facilitated volume changes of the coelomic cavity due to dorso-ventral rotation of the ‘synsacrum’ on the dorsal vertebrae.
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A profusion of white fibers issuing from the ventral aspect of the dentate nucleus converge rostrally to form the main part of the superior cerebellar peduncle.
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The Anterior Median Fissure (fissura mediana anterior; ventral or ventromedian fissure) contains a fold of pia mater, and extends along the entire length of the medulla oblongata: it ends at the lower border of the pons in a small triangular expansion, termed the foramen cecum.
IX. Neurology. 4a. The Hind-brain or Rhombencephalon
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With regard to the specific characters of the species of _Zeugopterus_ nothing is known of peculiarities in mode of life which would give an importance in the struggle for existence to the concrescence of the pelvic fins with the ventral in _punctatus_, to the absence of this character and the elongation of the first dorsal ray in _unimaculatus_, or to the absence of both characters in _norvegicus_.
Hormones and Heredity
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These decussating bundles can be seen distinctly between the lips of the ventral median fissure.
