File:Diseases of the nervous system (1910) (14770708964).jpg

Identifier: diseasesofnervou00chur (find matches)
Title: Diseases of the nervous system
Year: 1910 (1910s)
Authors: Church, Archibald, b. 1861, ed Salinger, Julius L. (Julius Lincoln), tr
Subjects: Nervous system
Publisher: New York and London : D. Appleton and company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Fig. 120.—Bilateral Descending Degen-eration of the Pyramidal Tract. ated bundles usually (not always!) liethe shape of a comma on transsection. The principal mass of the descending degenerative fibers is situated inthe lateral and anterior columns. In the lateral column this region is desig- OTHER DISEASES OF THE CENTRAL NERVOUS SYSTEM 123 nated as the pyramidal tract (Fig. 118, e and /, Figs. 119-121). It is usu-ally situated in the posterior internal portion of the lateral column, but doesnot extend to its border zone nor to the gray substance. We have also seen that there are two other descending tracts in the lateral
Text Appearing After Image:
Fig. 121.—a, Diagram of descending degeneration of a pyramidal tract (after Edinger); b,transverse section of a degenerated pyramidal tract (on the right side) and of the pons. 124 HISTOLOGY OF THE CENTRAL NERVOUS SYSTEM columns which are subject to transverse lesions. One of these is Monalcowsbundle which descends from the middle brain in the lateral columns, partlybetween the pyramidal fibers but somewhat anterior and external to them,and the second is LbwentliaVs bundle which is situated quite ventrally in thelateral columns and at their margin. In the anterior columns at either side of the anterior longitudinal spaceis the remainder of the uncrossed pyramidal tracts, called Turks bundle,which also occasionally shows descending degeneration. Degenerations of fibers is simultaneously observed, usually in the anterior(white) commissure; these implicate continuations of the fibers of Turksbundle which have not yet crossed. In this region descending degeneration attacks all fibers wh

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