File:Diseases of the nervous system (1908) (14779228785).jpg

Identifier: diseasesofnervo00chur (find matches)
Title: Diseases of the nervous system ..
Year: 1908 (1900s)
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. 33. — Traxsa-erse Sectiox THRoroH the NormalGray Substance of the Anterior Horn of the Spi-NAL Cord. 44 HISTOLOGY OF THE CENTRAL NERVOUS SYSTEM or only pass along side tliem. But tlie adhesion of giia fibers to connectivetissue septa and vascular sheaths has been proven. II. THE GROUPING OF THE NERVOUS SUBSTANCE ANDTHE NEURON THEORY From the preceding description of its elements, it is apparent that thetissue of the nervous system is of very complicated composition, of which we have now obtained asomewhat clear idea. The majority of thenerve-cells are found onlyin the gray substance, rare-ly in those areas where thegray and white matter areintimately admixed (in themedulla oblongata, in thepons, in the mid-brain andinter-brain). The whitesul)stance itself containsnone of them. In manyareas of the gray substancethe nerve-cells are arranged
Text Appearing After Image:
Fig. 34.—Transverse Section through the NormalWhite Substance of the Spinal Cord. m groups. In the spinal cord, es-pecially in the dorsal por-tion, segmentation may be recognized from above downward, a metamericarrangement. In a horizontalsection there is seen a three-fold grouping of the anteriorhorn cells, especially in thecervical cord, to which is addedthe cell group of Clarkes col-umn in the thoracic cord.There are also numerous nerve-cells which are apparentlydistributed irregularly through-out the gray substance of thespinal cord. The entire cortex of thebrain shows the nerve-cellsarranged in layers, which dif-fer from each other in shapeand size. The nerve-cells ac-cumulate near the origin ofthe nerves of the brain, also -piG 35in its central ganglia and inthe gray nuclei of its trunk. The majority of these send nerve processesfrom the gray substance into the white; a few nerve-cells, usually the smaller

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