The anatomy of the nervous system, from the standpoint of development and function . Fig. 24.—Neurons with short axons (Type II of Golgi) from the cerebral cortex of a child: a, Axon. Golgi method. (Cajal.) antidromic conduction (Bayliss, General Physiology, p. 474), it seems best to consider bothcentral and peripheral branches as divisions of a common axonic stem. (See Barker, TheNervous System, p. 361.) From what has been said it will be apparent that a neuron usually possessesseveral dendrites and a single axon, but some have only one process, which isthen an axon. It may be added that some
The anatomy of the nervous system, from the standpoint of development and function . Fig. 24.—Neurons with short axons (Type II of Golgi) from the cerebral cortex of a child: a, Axon. Golgi method. (Cajal.) antidromic conduction (Bayliss, General Physiology, p. 474), it seems best to consider bothcentral and peripheral branches as divisions of a common axonic stem. (See Barker, TheNervous System, p. 361.) From what has been said it will be apparent that a neuron usually possessesseveral dendrites and a single axon, but some have only one process, which isthen an axon. It may be added that some neurons have more than one axon. Nerve-fibers are axons naked or insheathed. Two myelinated peripheralnerve-fibers are shown in Fig. 26. The axon or axis-cylinder is composed of 46 THE NERVOUS SYSTEM delicate neurofibrils embedded in a semifluid neuroplasm. It is surrounded bya relatively thick myelin sheath and a nucleated membranous neurilemma Fig. 25.—Primary motor neuron (diagram-matic): ah, Implantation cone of axon; ax,axon; c, cytoplasm; d, dendrites; w, myelinsheath; m, striated muscle; n, nucleus; »,nucleolus; nR, node of Ranvier; sf, collateral;si, neurilemma; tel, motor end-plate. (Barker,Bailey.)
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