How To Use Allantois In A Sentence
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Both the chorioallantoic placenta and CAM are derived from chorion and allantois
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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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Thus in many mammals the mesodermal part of the allantois often appears long before the endodermal part, though this is phylogenetically older.
Form and Function A Contribution to the History of Animal Morphology
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It is an interesting point that this vascular hood, called the allantois, is represented in the Amphibians by an unimportant bladder growing out from the hind end of the food-canal.
The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told
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It would he difficult for a mutationist to explain how a mutation should affect the development of the cloacal bladder to such an enormous degree, just when it was required for embryonic respiration, and cause the sides of the body to unite ventrally at the time of hatching, cutting off the allantois and the amnion.
Hormones and Heredity
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Thus in many mammals the mesodermal part of the allantois often appears long before the endodermal part, though this is phylogenetically older.
Form and Function A Contribution to the History of Animal Morphology
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Covering the external face of the amnion and lining the inner face of the chorion is a double membrane, _the allantois_.
Common Diseases of Farm Animals
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Among the important changes of the vertebrate organisation that marked the rise of the first Amniotes from salamandrine Amphibia during this period the following three are especially noteworthy: the entire disappearance of the water-breathing gills and the conversion of the gill-arches into other organs, the formation of the allantois or primitive urinary sac, and the development of the amnion.
The Evolution of Man — Volume 2
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The pedicle of the allantois, which connects the embryo with the placenta and conducts the strong umbilical vessels from the former to the latter, is covered by the amnion, and, with this amniotic sheath and the pedicle of the yelk-sac, forms what is called the umbilical cord (Figure 1.196 al).
The Evolution of Man — Volume 1
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The urachus is a remnant of allantoic origin, connecting the embryonal cloaca to the allantois during early intrauterine life.
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Fusion of the chorion and allantois forms either the chorioallantoic placenta in viviparous (live-bearing) species, or the chorioallantoic membrane
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Inside the egg are a series of fluid-filled membranes which permit the embryo to survive: the amnion, allantois, yolk sac, and chorion.
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Aristotle's view, arguing that the female seed contrib - utes only nutrition and the allantois, while the male seed forms the other embryonic membranes (chorion, amnion) and bodily parts.
Dictionary of the History of Ideas
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In reptiles, birds, and many mammals the allantois becomes expanded into a vesicle which projects into the extra-embryonic celom.
I. Embryology. 11. Development of the Fetal Membranes and Placenta
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It was known by the 1860's that various nutritive, respiratory, and excretory organs (yolk-sac, allantois) characteristic of embryos are lacking in all adults.
RECAPITULATION
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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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Inside, the amnion encloses the embryo in a protected, moist environment in which nourishment is supplied by the yolk sac, and metabolic waste is stored by the allantois.
Reptile
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The middle part of the streak gives rise mainly to lateral plate mesoderm, while the posterior part of the streak provides the extra-embryonic mesoderm of the amnion, visceral yolk sac, and allantois.
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The allantois, _al_, extends cephalad for some distance from the floor of the cloaca.
Development of the Digestive Canal of the American Alligator
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Covering the external face of the amnion and lining the inner face of the chorion is a double membrane, _the allantois_.
Common Diseases of Farm Animals
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In the region of the posterior appendages, _pa_, the section passes through the hindgut, _hg_, and allantois, _al_.
Development of the Digestive Canal of the American Alligator
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In the center of the figure the allantois, _al_, is seen as an irregular cavity, lined with a single layer of columnar or cuboidal cells, and surrounded by a thick mass of loosely arranged, stellate mesoblast cells.
Development of the Digestive Canal of the American Alligator
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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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Inside the egg are a series of fluid-filled membranes which permit the embryo to survive: the amnion, allantois, yolk sac, and chorion.
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A very early condition of Man, with yelk-sac, allantois, and amnion (original).
Essays
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Initially, the bladder is continuous with the allantois.
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The very young puppy, with attached ends of the yelk-sac and allantois, and invested in the amnion.
Essays
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In the fetus, the urachus connects the bladder with the allantois.
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The allantois is a structure that collects the waste that the embryo produces before it hatches.