. Comparative anatomy. Anatomy, Comparative. INCUSCQUADRATEJ— MALLEUS CARTICULAR) MECKEL'S CABTILAGE CMANDIBULAR^^ HYOID DENTARY- STYLOHYOID LIGAMENT CHYOID) -. HYOID BONE C. AMPHIBIAN AND REPTILE. D. MAMMAL. Fig. 501.—Diagrams of the first and second visceral arches in A, Elasmobranch, B, Teleost, C, Amphibian and Reptile, and D, Mammal, illustrating the transformation of the hinge of the jaw of lower vertebrates into the malleus and incus of the mammal. The third earbone, the stapes, comes from the hyomandibular. (Redrawn after Gegen- baur and Stempell.) The middle ear and the Eustachian tub
. Comparative anatomy. Anatomy, Comparative. INCUSCQUADRATEJ— MALLEUS CARTICULAR) MECKEL'S CABTILAGE CMANDIBULAR^^ HYOID DENTARY- STYLOHYOID LIGAMENT CHYOID) -. HYOID BONE C. AMPHIBIAN AND REPTILE. D. MAMMAL. Fig. 501.—Diagrams of the first and second visceral arches in A, Elasmobranch, B, Teleost, C, Amphibian and Reptile, and D, Mammal, illustrating the transformation of the hinge of the jaw of lower vertebrates into the malleus and incus of the mammal. The third earbone, the stapes, comes from the hyomandibular. (Redrawn after Gegen- baur and Stempell.) The middle ear and the Eustachian tube which leads from it to the pharynx are both derived directly from the spiracular pouch, a diverticu- lum of the pharynx. Consequently, both, like the pharynx from which they evaginate, are lined by endoderm. To meet this endodermic diverticulum, the ectoderm invaginates to form the external auditory meatus. The two-layered membrane between the two invaginations,. 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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Keywords: ., bookcentury1900, bookpublisherphi, booksubjectanatomycomparative
