. A treatise on mental diseases. Fie. 15.—Congenital Absence of the Eight Posterior Communicating Artery of theCircle of Willis. B., aged fifty-three years; presenile insanity. The arteries showedfibrosis with many atheromatous foci. Reproduced from a photograph. definite hyaline degeneration, with diseolourization and disappear-ance of their largenuclei. Then there begins an hypertrophy byproliferation of the fibrous elements, which, as the increase takes 94 .4 TREATISE ON MENTAL DISEASES place, progressively narrows the lumen of the artery until it is toosmall to admit of an equalized blood
. A treatise on mental diseases. Fie. 15.—Congenital Absence of the Eight Posterior Communicating Artery of theCircle of Willis. B., aged fifty-three years; presenile insanity. The arteries showedfibrosis with many atheromatous foci. Reproduced from a photograph. definite hyaline degeneration, with diseolourization and disappear-ance of their largenuclei. Then there begins an hypertrophy byproliferation of the fibrous elements, which, as the increase takes 94 .4 TREATISE ON MENTAL DISEASES place, progressively narrows the lumen of the artery until it is toosmall to admit of an equalized blood current, or becomes filled witha granular half-organized mass. In not a few instances (Fig. 13,. Fig. 16.—Congenital Absence of the Right Posterior Communicating Artery orthe Circle or Willis. The arteries showed a diffuse sclerosis. W., aged sixty-liveyears; senile melancholia. Reproduced from a photograph. Plate IV) the fenestrata and intima have become separated fromthe fibrinous mass by a fairly broad space containing hsematoidingrains. Owing to the necessary shrinkage due to hardening re-agents this space is probably wider in the preparation than it wasin reality during life. In only exceptional places was the intima ABNORMALITIES OF THE BASAL ARTERIES 95 thickened at all, and in these to an inconsiderable degree. The outerlayer is never implicated in the change to any considerable extent. The very frequent abnormalities in the construction of thebasilar arteries deserve a passing notice at the end of this chapter,as they are significant of the defective formation of the entire bodyin the insane—the vital clay is not moulded rightly, but allows de-fects in the formation
Size: 1295px × 1929px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1900, bookdecade1900, booksubjectmentaldisorders
