Roots of Spinal Nerves
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Illustrating the functions of the roots of the spinal nerves. Labels: a, ventral root; p, dorsal root. Divided at a. -- Irritated at 1: no result. Irritated at 2: contraction of muscles supplied with fibers from the root. Divided at p. -- Irritated at 3: no result. Irritated at 4: pain produced.
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Human Central Nervous SystemSource
Martin, H. Newell The Human Body: A Text-book of Anatomy, Physiology and Hygiene (New York: Henry Holt and Company, 1900) 249
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