. Chordate anatomy. Chordata; Anatomy, Comparative. 176 CHORDATE ANATOMY Development of the Visceral Skeleton. In the human embryo a series of visceral arches separated by pharyngeal pouches appear in relations corresponding to those of aquatic vertebrates. In the first of those arches the maxilla of the upper jaw and the mandible of the lower jaw develop. Fig. 165.—Early chondrocranium of Squalus. (The brain in outline.) als, alisphenoid cartilage; ch, anterior end of notochord; h, hyoid arch; ?na, mandibular arch, not yet divided into pterygoquadrate and Meckelian; oc, otic capsule; t, trabe
. Chordate anatomy. Chordata; Anatomy, Comparative. 176 CHORDATE ANATOMY Development of the Visceral Skeleton. In the human embryo a series of visceral arches separated by pharyngeal pouches appear in relations corresponding to those of aquatic vertebrates. In the first of those arches the maxilla of the upper jaw and the mandible of the lower jaw develop. Fig. 165.—Early chondrocranium of Squalus. (The brain in outline.) als, alisphenoid cartilage; ch, anterior end of notochord; h, hyoid arch; ?na, mandibular arch, not yet divided into pterygoquadrate and Meckelian; oc, otic capsule; t, trabecula; 1-5, branchial arches; cartilages dotted. (From Kingsley's " Comparative Anatomy of Vertebrates," after Sewertzoff.) as membrane bones. The mandible, however, surrounds a cartilage, Meckel's cartilage, which corresponds to the mandibular cartilage of the lower jaw of elasmobranchs. While most of Meckel's cartilage disappears during ontogenesis, that portion which extends into the cavity of the middle ear ossifies in two centers, one of which forms the malleus and the other. 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 & Co.
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