A manual of diseases of the nervous system . COMPRESSION. 347 various cell-forms may be found, but it ultimately presents theappearance of a dense reticulum. The nerve-elements undergo de-generation, and abundant masses of myelin, granule corpuscles, andcorpora amylacea are visible in the fresh state or in glycerine pre-parations of the hardened cord (Fig. 107, c). Many nerve-fibrespersist, however, with a narrowed sheath of myelin, and it is probablethat these regain the power of conducting, in spite of the persistenceof considerable, and even dense sclerosis in the part. In extremecases all
A manual of diseases of the nervous system . COMPRESSION. 347 various cell-forms may be found, but it ultimately presents theappearance of a dense reticulum. The nerve-elements undergo de-generation, and abundant masses of myelin, granule corpuscles, andcorpora amylacea are visible in the fresh state or in glycerine pre-parations of the hardened cord (Fig. 107, c). Many nerve-fibrespersist, however, with a narrowed sheath of myelin, and it is probablethat these regain the power of conducting, in spite of the persistenceof considerable, and even dense sclerosis in the part. In extremecases all the fibres seem to be destroyed at the point of chief compres-. ./ Fig. 107.—Pressure-myelitis; portions of the section D in Pig. 106 morehighly magnified. A, from the grey matter, numerous angular andfusiform cells; vessels with walls thickened by a growth of cells, nar-rowing the cavity, which in some is obliterated. B, from the whitecolumns; thickening of the interstitial tissue, nerve-fibres in pnrtdestroyed, in part narrowed ; a vessel with thickened walls. C, glycerinepreparation from white substance; abundant products of degeneration ofthe nerve-fibres, in part aggregated into granule-masses. D, section ofa nerve-root passing by compressed area; increase of interstitial tissue,many nerve-fibres narrowed, some with swollen axis-cylinders. sion, but there is never an actual division of the cord itself. The greymatter can scarcely be distinguished from the white, even with themicroscope, and the ganglion-cells become shrunken and walls of the small vessels are often thictened by spindle-cells,disposed more or less concentricall
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnervoussystem, bookye
