File:Diseases of the nervous system (1910) (14792892653).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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, therefore, haveno central sensory continuation. Other posterior root fibers and collateralsof the gray substance communicate with cells of Clarkes columns (columnavesicalis) ; this is particularly marked in the dorsal cord, and takes place atthe base of the posterior horn just where the posterior gray commissure arises. NEURON SYSTEMS AND NEURON DISEASES 87 A second sensory neuron does not develop from the cells which here surroundit. On the contrary (Figs. 85, 86), the fibers of these cells pass upward inthe spinal cord as a neuron of the cerebellum, they enter the lateral column,and emerge at its external periphery as the cerebellar lateral column tract(Figs. 85, 86). Finally, some posterior root fibers from the posterior hornterminate in cells in but a few of which short tracts develop inside of thespinal cord (Figs. 38, 84) (column cells, association tracts). Bulbus oculsinister (Guddeni)Tractus opticusdexter Thalamus Radiatio occipi- c-to-thalaniica(Gratioleti) Lobus occipitali
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Uncrossed bundles of the optic t Crossed bundles uf the optic tract Radix medialis Radix lateralis Nucl. corporis geniculati lateralis ~^ Colliculus Corpora quadrigemina Cornu posterius ventriculi lateralis^ Tapetum ~~ Cuneus Fig. 82.—Tract of the Optic Nerve (First Nextrox Red). (After Toldt.) 88 HISTOLOGY OF THE CENTRAL NERVOUS SYSTEM The ramifications of the sensory cranial nerve roots are similar, in so faras they have been investigated. The first sensory neuron, with manifold combinations, finally communi-cates with the actual second sensory neuron. It arises from those nuclei which have already been described asterminal nuclei of the first sen-sory tract, and the course of thesefibers we will now follow. The cells from which the sec-ond sensory neurons originate arefound in large numbers in the pos-terior horns of the spinal cord.Their processes pass transverselythrough the gray substance, firstanteriorly into the anterior com-missure, and subsequently uponthe other side (Figs

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