. Comparative anatomy. Anatomy, Comparative. SENSORY GANGUON NOTOCHORD HYPOCHORDA "DORSAL AORTA POSTCARD!NAL VEIN SPINAL NERVE FIN-BUD VITELUNE VEIN MESENCHYME Fig. 241.—A cross section of a 17 mm. elasmobranch (squalus) embryo in the trunk region, showing an early stage in the growth of a myotomic bud into the fin-fold. The yolk-sac to which the embryo is attached has been removed. two methods are after all not radically different. In fishes, for example, where most of the appendicular muscles arise from myotomic buds, some muscles which develop later than the others come from migrant me
. Comparative anatomy. Anatomy, Comparative. SENSORY GANGUON NOTOCHORD HYPOCHORDA "DORSAL AORTA POSTCARD!NAL VEIN SPINAL NERVE FIN-BUD VITELUNE VEIN MESENCHYME Fig. 241.—A cross section of a 17 mm. elasmobranch (squalus) embryo in the trunk region, showing an early stage in the growth of a myotomic bud into the fin-fold. The yolk-sac to which the embryo is attached has been removed. two methods are after all not radically different. In fishes, for example, where most of the appendicular muscles arise from myotomic buds, some muscles which develop later than the others come from migrant mesen- chymatous cells as they do in mammals. Similarity of innervation, 3ny my. Fig. 242.—Budding of muscles of appendage from myotomes in PrisHurus. b, muscle buds; my, myotomes. (From Kingsley's "Comparative Anatomy of Vertebrates," after Rabl.) however, attests the homology of the appendicular muscles throughout the vertebrate series. The fact that the arm muscles of man are innervated by the last four cervical and the first thoracic nerves further justifies the assumption that. 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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