NOUN
- any bone that develops within membranous tissue without previous cartilage formation; e.g. the clavicle and bones of the skull
How To Use membrane bone In A Sentence
- These accessory nuclei possess no separate ossific centers, but are invaded by the surrounding membrane bone and undergo absorption. II. Osteology. 5b. 8. The Mandible (Lower Jaw)
- Besides the teeth there perhaps remain relics of the placoid scales in the anatomy of the higher vertebrata, in the membrane bones. Text Book of Biology, Part 1: Vertebrata
- Bony fishes, lungfishes, & most ganoids - retain highly cartilaginous neurocranium that is covered by membrane bone
- The upper jaw has a great bar of cartilage, the palato-pterygoid, as its sole support; the arch of premaxilla, maxilla, jugal, and squamosal -- all membrane bones -- is, of course, not represented. Text Book of Biology, Part 1: Vertebrata
- Hertwig followed up this clue, and came to the conclusion not only that placoid scales and teeth were strictly homologous, but also that all membrane bones were derived phylogenetically from ossifications present in the skin or in the mucous membrane of the mouth, just as cartilage bones were derived from the cartilaginous skeletons of the primitive Vertebrates. Form and Function A Contribution to the History of Animal Morphology
- These facts seem to point to stages in the fusion of placoid bases, and their withdrawal from the surface to become incorporated with the cranial apparatus as membrane bones, a process entirely completed in the mammalian type. Text Book of Biology, Part 1: Vertebrata
