. A treatise on anatomy, physiology, and hygiene : designed for colleges, academies, and families. Fig. Fig. 128. A section of the and spinal column. 1, The cerebrum. 2. Th«cerebellum. 3, The medulla oblongata. 4, 4, The spinal cord in it* canal. Fig. 129. Anterior view of the brain and spina, cord. 1, 1, The two hemispheresof the cerebrum. 3, 3, The cerebellum. 4, The olfactory nerve. 5 The opt*nerve. 7, The third pair of nerves. 8, The pons varol,,. 9, Thefourthj«rfnerves 10 The lower portion of the medulla oblongata. It, U, The spinal cord.~ Spta. nerves. 13, 13, The brachia. pl
. A treatise on anatomy, physiology, and hygiene : designed for colleges, academies, and families. Fig. Fig. 128. A section of the and spinal column. 1, The cerebrum. 2. Th«cerebellum. 3, The medulla oblongata. 4, 4, The spinal cord in it* canal. Fig. 129. Anterior view of the brain and spina, cord. 1, 1, The two hemispheresof the cerebrum. 3, 3, The cerebellum. 4, The olfactory nerve. 5 The opt*nerve. 7, The third pair of nerves. 8, The pons varol,,. 9, Thefourthj«rfnerves 10 The lower portion of the medulla oblongata. It, U, The spinal cord.~ Spta. nerves. 13, 13, The brachia. plexus. 14, 14, The lumbar and , 758. How many pairs of nerves issue from the spinal cord ? Explain128. Fig. 129. ^^ 342 ANATOMY, PHYSIOLOGY, AND HYGIENE. roots ; an anterior, or motor root, and a posterior, or sensitiveroot. Each nerve, when minutely examined, is found to con-sist of an aggregate of very delicate filaments, enclosed in acommon cellular envelope. 759. The anterior roots arise from a narrow white lineupon the anterior columns of the spinal cord. The posteriorroots arise from
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