. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE F(ETUS. 1035 bral laminfe ; they are developed after the sixth week, progressing with the growth of the parts they are destined to cover. 4. Dn'elopmmt of the nerves.—'The development of the nerves is somewhat obscure. The motor roots seem to arise from the cord ; but the spinal ganglia are formed separately in the protovertebrte, and perhaps originate the sensitive roots. The nerve-branches begin by elongated ramifying cells, which become fused to each other by their extremities—the nuclei of the cells lying at the
. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE F(ETUS. 1035 bral laminfe ; they are developed after the sixth week, progressing with the growth of the parts they are destined to cover. 4. Dn'elopmmt of the nerves.—'The development of the nerves is somewhat obscure. The motor roots seem to arise from the cord ; but the spinal ganglia are formed separately in the protovertebrte, and perhaps originate the sensitive roots. The nerve-branches begin by elongated ramifying cells, which become fused to each other by their extremities—the nuclei of the cells lying at the periphery becoming the nuclei of the white substance of Schwann, the proper nerve-tissue being afterwards gradually deposited between the axis-cylinder and the envelope. Fig. 570. Fig. TRANSVERSE SECTION OF THE EMBRVO OF A FOWL AT THE BEGINNING OF THE THIRD DAY OF INCUBATION, X 90-100. ch, Chorda dorsalis; wwh, position of a thinning, or cavity in the protoverte- bral mass, dividing it into an anterior and posterior portion; hp, parietal lamina; df, intestinal fibrous lamina; dd, intestinal glandular lamina; dr, primitive intestinal groove; A, corneal lamina j mr, medullary tube (spinal cord); m, muscular lamina; /), pleuro- peritoneal cavity; af, fold of the amnion ; ao, primitive aorta; t)C, vena cardinalis; un, Wolffian body ; ung, duct of the Wolffian 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 Chauveau, A. (Auguste), 1827-1917; Arloing, S. (Saturnin), 1846-1911; Fleming, George, 1833-1901. New York, D. Appleton
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