. A manual of diseases of the nervous system. ons are the dila-tation of vessels, which is oftenvery great, and the accumulation of leucocytes and other cell-elements in the tissue, and especially about the vessels. In the whitesubstance the larger vessels are conspicuous by their enlargement,and in the grey substance the dilated arteries and capillaries mayoccupy a considerable part of the tissue (Figs. 98, 99, a). The nucleiof the capillaries are large and numerous. The walls of the smallerarteries are encrusted with leucocytes in the early stage, and, lateron, in both white and grey substan
. A manual of diseases of the nervous system. ons are the dila-tation of vessels, which is oftenvery great, and the accumulation of leucocytes and other cell-elements in the tissue, and especially about the vessels. In the whitesubstance the larger vessels are conspicuous by their enlargement,and in the grey substance the dilated arteries and capillaries mayoccupy a considerable part of the tissue (Figs. 98, 99, a). The nucleiof the capillaries are large and numerous. The walls of the smallerarteries are encrusted with leucocytes in the early stage, and, lateron, in both white and grey substance, are much thickened by cells,the nuclei of which are often elongated and more or less concen-tric to the lumen of the vessel (Fig. 102, d). Outside this thickenedwaU the perivasctilar sheath is enormously distended, at first by leuco-cytes, among which, afterwards, other cells are mingled—round,fusiform, angular, with leucocyte-like nuclei (Fig. 102). Bi transversesection this distended sheath may look, at first sight, l^e an enormously. Fia. 97.—Myelitis, a, an irregularlyswollen axis-cylinder. 5, section ofnerve-fibre with swollen , section of white substance, withgranule-masses and atrophied nerve-fibres, d, corpora amylacea. (PromLeyden.) 850 SPINAL CORD. thickened wall. Ked blood-corpuscles distend the vessels and are seenalso in the adjacent tissue, sometimes uniformly scattered through it(Fig. 102, f), sometimes aggregated in small extravasations due to therupture of minute vessels. The grey substance is densely set withround corpuscles, staining deeply, many of which are the nuclei ofsmall fusiform or angular cells (Figs. 99, a, 101, b), while the inter-vening substance is much more granular than in health. The nerve-
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectnervoussystemdisease
