A treatise on the principles and practice of medicine . Fig. 55.—Showing course of individual fibers of motor tracts. CEREBRAL HEMORRHAGE 767 become progressively smaller and cease just above the conus children a cerebral lesion may cause degeneration in the anterior hornsof the cord and their fibers. An ascending degeneration occurs onlywhen the large pyramidal tracts of the cortex are diseased, except in theyoung, in whom degeneration of all neurones is prone to follow thedestruction of one neurone. (See figures under Localization in the. Fig. 56.—Horizontal section through the
A treatise on the principles and practice of medicine . Fig. 55.—Showing course of individual fibers of motor tracts. CEREBRAL HEMORRHAGE 767 become progressively smaller and cease just above the conus children a cerebral lesion may cause degeneration in the anterior hornsof the cord and their fibers. An ascending degeneration occurs onlywhen the large pyramidal tracts of the cortex are diseased, except in theyoung, in whom degeneration of all neurones is prone to follow thedestruction of one neurone. (See figures under Localization in the. Fig. 56.—Horizontal section through the right hemisphere: 1, cortex; 2, white substance;3, internal capsule; 4, optic thalamus; 5, lenticular nucleus; 6a, anterior horn; and 66,posterior horn of the lateral ventricle. (After Dejerine.) Spinal Cord.) Other degenerations: (a) The optic radiation degenerateswhen a lesion occurs in the cortex of the cuneus and also degenerativechanges in the external geniculate body and pulvinar. After years itmay reach the optic nerve, (b) Hemorrhage in the second and thirdfrontal lobes leads to degeneration in the anterior limb of the capsule,median basal fibers of the crus and the fibers connecting the optic thala- 768 DISEASES OF THE BRAIN mus with the cortex, (c) Lesions in the temporal lobes cause degenera-tion in the lateral part of the crus. (d) Degeneration in the medianlemniscus follows diseases of the cortex, the subthalamic region and theupper part of the pons; it crosses to the opposite nuclei of the medullaand after years destroys the gang
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphiladelphialeafeb
