. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. 86 COMPARATIVE MORPHOLOGY OF VERTEBRATES. with the columella, which meets the tympanic membrane. This membrane is stretched on a cartilaginous tympanic annulus, derived from the pterygoquadrate. (Annulus and columella are lacking in those genera, Bombinator, etc., which have no tympanum). There is no connexion between stapes and quadrate. The chondrocranium largely persists, the only constant cartilage bones being the exoccipitals and prootics. A supraoccipital rarely occurs and basioccipital and £ trned. FIG.
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. 86 COMPARATIVE MORPHOLOGY OF VERTEBRATES. with the columella, which meets the tympanic membrane. This membrane is stretched on a cartilaginous tympanic annulus, derived from the pterygoquadrate. (Annulus and columella are lacking in those genera, Bombinator, etc., which have no tympanum). There is no connexion between stapes and quadrate. The chondrocranium largely persists, the only constant cartilage bones being the exoccipitals and prootics. A supraoccipital rarely occurs and basioccipital and £ trned. FIG. 87.—-Chondrocranium of a frog after metamorphosis, from Gaupp. fov, fenestra ovalis; m, Meckel's cartilage; mtg, metapterygoid; nc, nasal capsule; ptgq, pterygoquadrate; tnas, tectum nasalis; tsyn, tectum synoticum; timed, taenia tecti medialis. basisphenoid are unknown. In the ethmoid region, except in the aglossa, there is a peculiar bone, the sphenethmoid, which arises as two bones on either side. These fuse, forming a ring ('os en ceinture') around the olfactory nerves and the anterior end of the brain. The frontals and parietals of a side are fused and often the fronto-parietals are continuous across the middle line. They may extend to the nasals or there may. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kingsley, J. S. (John Sterling), 1854-1929. Philadelphia, P. Blakiston's son & co.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1912
