. The elements of pathological histology with special reference to practical methods . rs a more or less considerablefibrous thickening of the pia mater and arachnoid, and in spinalmeningitis even an adhesion of tliese membranes to the dura mater{d), which again may give rise to atrophy of the nerves enclosed inthe shrinkino connective tissue. 346 THE CENTRAL NERVOUS SYSTEM Acute inflammation of the dura mater, acute pachymeningitis (), is always set up by extension from the surrounding exudation has the same character as in leptomeningitis, exceptthat it is situated chiefly u
. The elements of pathological histology with special reference to practical methods . rs a more or less considerablefibrous thickening of the pia mater and arachnoid, and in spinalmeningitis even an adhesion of tliese membranes to the dura mater{d), which again may give rise to atrophy of the nerves enclosed inthe shrinkino connective tissue. 346 THE CENTRAL NERVOUS SYSTEM Acute inflammation of the dura mater, acute pachymeningitis (), is always set up by extension from the surrounding exudation has the same character as in leptomeningitis, exceptthat it is situated chiefly upon the surface {a and h), internal orexternal, whilst the tissue of the dura (c) merely shows a com-paratively slight degree of small-celled infiltration. Much more frequent is the chronic inflammation, pachymeningitisintern/i chronica seu limmorrhagica, in which a formation of delicatemembranous deposits takes place on circumscribed patches or overthe entire extent of the internal surface of the dura mater, thesedeposits consisting at first of fibrin and isolated round cells, but. Fk;. 171.—FiBRINO-PURULENT INTERNAL PaCHYMENINCUTIS IN OTITIS INTERNA. X 440; the cocci, however, drawn in under an amplification of x 925. (Weigertsmodification of Grams method.) a, Pus-corpuscles, between which lie chains ofcocci {Streptococcus -pyogenes); b, Fibrinous exudation; c, Dura mater, with cellularinfiltration. later of a highly vascular embryonic or connective tissue. As theblood-vessels of the latter are very thin-walled, haemorrhages anddeposits of pigment are also usually found. 6. Infective Granulomata and New-Formations.—Ttcberculosis usuallyoccurs in the brain and spinal cord in the form of rather large,solitary, completely caseous nodules, only surrounded at their peri-phery by a narrow zone of granulation tissue, which, however,may still enclose typical epithelioid-celled or giant-celled the inner meninges of the brain and cord, tuberculosis (Fig. 172)gives rise
Size: 1659px × 1506px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectpatholo, bookyear1895
