. Comparative anatomy. Anatomy, Comparative. THE MUSCULAR SYSTEM 289 ventral moieties, from which develop respectively the levator and depressor muscles of the appendage. (Figs. 241, 242) The appendicular muscles of man and mammals, on the contrary, do not develop from myotomic buds, but arise by cell migration. The SPINAL CORD DERMATOME SOMATIC MOTOR NERVE MYOTOMr. 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
. Comparative anatomy. Anatomy, Comparative. THE MUSCULAR SYSTEM 289 ventral moieties, from which develop respectively the levator and depressor muscles of the appendage. (Figs. 241, 242) The appendicular muscles of man and mammals, on the contrary, do not develop from myotomic buds, but arise by cell migration. The SPINAL CORD DERMATOME SOMATIC MOTOR NERVE MYOTOMr. 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. 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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