. Comparative anatomy. Anatomy, Comparative. THE SKELETAL SYSTEM 235 ear ossifies in two centers one of which forms the malleus and the other the incus. The so-called Meckel's cartilage of the mammalian embryo appears therefore to correspond not only to the mandibular or Meckel's cartilage. Fig. 191.—Early chondrocranium of Acanthias. (The brain in outline.) als, alisphenoid cartilage; ch, anterior end of notochord; h, hyoid arch; ma, mandibular arch, not yet divided into pterygoquadrate and Meckelian; oc, otic capsule; t, trabecula; r-5, branchial arches; cartilages dotted. (From Kingsley's &
. Comparative anatomy. Anatomy, Comparative. THE SKELETAL SYSTEM 235 ear ossifies in two centers one of which forms the malleus and the other the incus. The so-called Meckel's cartilage of the mammalian embryo appears therefore to correspond not only to the mandibular or Meckel's cartilage. Fig. 191.—Early chondrocranium of Acanthias. (The brain in outline.) als, alisphenoid cartilage; ch, anterior end of notochord; h, hyoid arch; ma, mandibular arch, not yet divided into pterygoquadrate and Meckelian; oc, otic capsule; t, trabecula; r-5, branchial arches; cartilages dotted. (From Kingsley's " Comparative Anatomy of Vertebrates," after Sewertzoff.) of lower vertebrates, but with their quadrate element also. The quadrate element develops into the incus while the articular portion or articulare element of the mandibula ossifies as the malleus. All this agrees com- pletely with the evidence from comparative anatomy, which makes the. 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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