File:A text-book of human physiology (1906) (14747510946).jpg

Identifier: textbookofhumanp00tige (find matches)
Title: A text-book of human physiology
Year: 1906 (1900s)
Authors: Tigerstedt, Robert, 1853-1923 Murlin, John R. (John Raymond), b. 1874, tr
Subjects: Physiology
Publisher: New York and London, D. Appleton and Co.
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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rd contains the prolonga-tions of the posterior lumbosacraland lower thoracic roots, whilethe higher thoracic root fibers lieoutside these. At the cephalicend of the cord these differentdivisions become separated exter-nally by a strong connective-tis-sue septum; the median divisionis then known as Golls column,the lateral as Burdachs column.The fibers of Golls column endin the gracilar nucleus, those ofBurdachs column in the cuneatenucleus. There is authority alsofor the statement that fibers fromboth columns pass directly to thecerebellum and end there. The secondary afferent tractsarise from the nerve cells withwhich the fibers of the posteriorroots and their collaterals unite.The following are the betterknown among them : (1) Fibersfrom the gracilar and cuneatenuclei pass to the opposite side ofthe medulla and continiie forwardin the fiUet. (2) Long fibers arising from cells of the posterior horn traversethe anterior and lateral columns of the same and of the opposite sides as the
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Tig. 265.—Diagram of the course of the sensory con-ducting pathways after Striimpel. A, entranceof the posterior sensory root fibers in tlie lum-bar cord; gi, spinal ganglion; rp, posterior root. CONDUCTING PATHWAYS IN THE SPINAL CORD 593 ventrolateral cerehellar tract or Gowerss bundle; in front of the pons theybend around and enter the cerebellum by way of the superior peduncle. (3)Fibers which originate in the cells of Clarkes. column pass forward to thecerebellum. Some of these are scattered among the fibers of other tracts, butpart of them also form a compact bundle (Flechsigs bundle), which,.from itsposition in the cord, is described as the dorsolateral cerebellar tract. All thesefibers pass through the inferior peduncle and can be traced to the superiorvermis of the cerel)ellum. . The anterior roots are for the most part connected with nerve cells of theanterior horn on the same side; a few anterior root fibers spring from cellsof the opposite side. Secondary efferent pathway

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