File:Kirkes' handbook of physiology (1907) (14583208070).jpg

Identifier: kirkeshandbookof00kirk (find matches)
Title: Kirkes' handbook of physiology
Year: 1907 (1900s)
Authors: Kirkes, William Senhouse, 1823-1864 Greene, Charles Wilson, 1866-1947
Subjects: Physiology
Publisher: New York, W. Wood and company
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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the cord in several bundles, which may becalled: 1, Internal; 2, Middle; 3, External. All have their origin from thegroups of multipolar cells in the anterior cornua. The internal fibers areoriginated partly in the internal group of nerve cells of the anterior cornu 518 THE NERVOUS SYSTEM of the same side; but some fibers can be traced through the anterior com-missure to cells of the anterior cornu of the opposite side. The Posterior Roots. The fibers of the posterior roots enter the spinalcord to the inner or median side of the posterior cornu. The fibers,as soon as they reach the cord, divide in a fork-like fashion, one branchpassing down a short distance, about three centimeters, the other branchpassing up for a shorter or longer distance. This upper branch some-times reaches the whole extent of the cord, but generally it extends overonly one or two segments of the cord. The divisions of the posterior rootfibers give off in their course numerous collaterals, figure 368. The fibers
Text Appearing After Image:
FlG. 363.—Section of the Spinal Cord, Showing the Grouping of Nerve-Cells and the Course ofNerve Fibers Entering in Posterior and Anterior Roots. (After Lenhossek.) of the posterior roots are divided into two sets, an internal or median, an ex-ternal or lateral group. The lateral set consists mostly of small fibers whichenter the cord opposite the tip of the posterior horn. The fibers pass in partto the marginal column of Lissauer, where they ascend and descend; in partthey penetrate the posterior horn, and come in relation with its cells. Fromthe median set some fibers pass to Clarkes column, others pass by wayof the posterior commissure to the median cells of the other side. Otherspass through the gray matter to the anterior horn cells of the same side.Besides this, they are connected through collaterals with the intrinsic cells ofthe gray matter at different levels of the cord. One can realize that eachnerve root has, in this way, an effective grip upon a large extent of the cord

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