This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 Excerpt: ...a process ending in an enlargement. The process arises as an outgrowth of the cell-body, and forms the axis cylinder or axone of a nerve-fiber; the terminal enlargement is known as the cone of growth, because the growth processes by which the axone increases in length are presumably located here. It may be stated as an ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 Excerpt: ...a process ending in an enlargement. The process arises as an outgrowth of the cell-body, and forms the axis cylinder or axone of a nerve-fiber; the terminal enlargement is known as the cone of growth, because the growth processes by which the axone increases in length are presumably located here. It may be stated as an invariable rule that each axone process of a medullary neuroblast arises as an outgrowth, and grows to its Fig. 139.--Transverse section through the spinal cord and ganglion of a chick about the end of the third day; prepared by the method of Golgi. (After Ramon y Cajal.) C, Cones of growth. Nbl. 1, 2, 3, 4, Neuroblasts of the lateral wall (1 and 2); of the spinal ganglion (3); of the ventral horn (motor neuroblasts) (4). final termination without addition on the part of other cells. The body of the neuroblast forms the nerve-cell, from which, later on, secondary processes arise constituting the dendrites. The view that each nerve-cell with its axone process and dendrites is an original cellular individual, is known as the neurone theory. For the central nervous system this view is generally held, but its extension to the peripheral system is opposed by some on the ground that the axone in peripheral nerves is formed within hains of cells, and is thus strictly speaking not an original product of the neuroblast, though it may be continuous with the axis cylinder process of a neuroblast. This view is discussed under the peripheral nervous system. Each medullary neuroblast is primarily unipolar and the axone is the original outgrowth. Soon, however, secondary protoplasmic processes arise from the body of the nerve-cell and form the dendrites. These appear first in motor neuroblasts of the ventrolateral portion of the embryonic cord, whose axones...
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