. Comparative anatomy. Anatomy, Comparative. Fig. 165.—Diagram tn, myotome; tns, Around this the ing mesenchyme; migrat- , noto- chord; s, spinal cord; v, vein. (From Kingsley's skeleton is the notochord definitive axial skeleton is built; and the notochord disappears, slight traces only being "Comparative Anatomy of left as nuclei pulposi of the intervertebral cartilages. The processes involved in this replacement are complicated, beginning with the appearance of mesenchyma cells around the notochord __^^^^^^^^^^^s§«:ss2Sii:^^^^^S5EES— EPIDERMIS I—SCLEROTOME NOTOCHORD —MYOTOME — DERMATOM
. Comparative anatomy. Anatomy, Comparative. Fig. 165.—Diagram tn, myotome; tns, Around this the ing mesenchyme; migrat- , noto- chord; s, spinal cord; v, vein. (From Kingsley's skeleton is the notochord definitive axial skeleton is built; and the notochord disappears, slight traces only being "Comparative Anatomy of left as nuclei pulposi of the intervertebral cartilages. The processes involved in this replacement are complicated, beginning with the appearance of mesenchyma cells around the notochord __^^^^^^^^^^^s§«:ss2Sii:^^^^^S5EES— EPIDERMIS I—SCLEROTOME NOTOCHORD —MYOTOME — DERMATOME Fig. 166.—A horizontal section of an elasmobranch embryo, showing the differentia- tion of the mesoderm (epimere) into sclerotome, myotome and dermatome. The sclerotome surrounding the notochord gives rise to the centrum of the vertebra. and the neural tube. In this mesenchymal matrix, cartilage develops only to be destroyed in its turn and replaced by bony vertebrae. The mesenchyma from which the vertebrae arise is produced by proliferation of the sclerotome, the cells of which migrate into the space. 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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