. A manual of diseases of the nervous system. lismand after injuries. Pathological Anatomy.—In slight and moderate degree, there ismerely opacity and thickening of the membranes affected, sometimeswith distension of vessels or minute spots of extravasation. Theopacity of the arachnoid may be such that the spinal cord cannot beseen through it. The inner surface of the dura mater may begranular when it is not otherwise changed. The spinal fluid isincreased in quantity and is turbid. When the changes are greaterin degree, the dura mater and pia mater may be connected togetherby a layer of inflamm
. A manual of diseases of the nervous system. lismand after injuries. Pathological Anatomy.—In slight and moderate degree, there ismerely opacity and thickening of the membranes affected, sometimeswith distension of vessels or minute spots of extravasation. Theopacity of the arachnoid may be such that the spinal cord cannot beseen through it. The inner surface of the dura mater may begranular when it is not otherwise changed. The spinal fluid isincreased in quantity and is turbid. When the changes are greaterin degree, the dura mater and pia mater may be connected togetherby a layer of inflammatory tissue of considerable thickness, so that itmay be impossible to say in which membrane the disease microscope shows the ordinary elements which result frominflammation, cells of various kinds, many lymphoid and pus-likecorpuscles, and distended vessels, often incrusted by similar also the pia mater is transformed into a thick irregularlayer of homogeneous tissue in which no distinct cell-elements can be. ^ at Fia. 92.— Chronic alcoholic meniDgitis. Section of edge of anterior column and ofa large nerve-root; carmine preparation, p. m., pia mater irregularly thickenedand transformed into amorphous-looking tissue, from which wedge-shapedbranching tracts {x x) extend into the white substance j , fasciculi of nerve-fibres entering the cord; a., an artery in the nerve-root, enlarged and withthickened walls; t. t,, tracts of amorphous connective tissue; e., a smallextravasation. perceived, and only faint indications of a fibrous structure (Fig. 92). The walls of its vessels may be greatly thickened by similar material. The nerve-roots passing through the diseased membranes very seldom escape, as they may in the acute form, but are inflamed, 282 SPINAL MEMBRANES. reddened, and swollen in the active stage, and afterwards com-pressed and atrophied, if the amount of new tissue formed aboutthem is considerable. The fibres suffer especially when
Size: 2170px × 1152px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectnervoussystem, bookye
