. Chordate anatomy. Chordata; Anatomy, Comparative. THE NERVOUS SYSTEM 373 The visceral motor fibers which appear in the dorsal roots of lower vertebrates are not found in the dorsal spinal nerves of mammals. The neurites of the ventral roots are purely efiferent. Of these there are two kinds, somatic motor and visceral motor. The somatic innervate skeletal muscles derived from the mesodermal somites, the visceral are Docsal Root Venirat Roai Ramus dor^alis. Fig. 330.—Diagram of the nerve components of a spinal nerve. Somatic motor fibers are indicated by continuous lines; visceral motor in lo
. Chordate anatomy. Chordata; Anatomy, Comparative. THE NERVOUS SYSTEM 373 The visceral motor fibers which appear in the dorsal roots of lower vertebrates are not found in the dorsal spinal nerves of mammals. The neurites of the ventral roots are purely efiferent. Of these there are two kinds, somatic motor and visceral motor. The somatic innervate skeletal muscles derived from the mesodermal somites, the visceral are Docsal Root Venirat Roai Ramus dor^alis. Fig. 330.—Diagram of the nerve components of a spinal nerve. Somatic motor fibers are indicated by continuous lines; visceral motor in long broken lines; somatic sensory in short broken lines; visceral sensoi»y by fine dotted lines. (From B. Patten, after Froriep.) connected through the sympathetic ganglia with visceral involuntary muscles or with glands. The ganglion cells of both types lie within the gray matter of the spinal cord; but those of the somatic motor nerves lie in the ventral column, while the visceral motor fibers come from ganglion cells in the intermedio-lateral column. See Fig. 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 & Co.
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