Manual of pathological anatomy . veway under one abnormally of the Vessels, — Amorbid condition of the coats ofthe vessels is, however, so muchthe most powerful factor in thecausation of apoplexy, that somepathologists have spoken of itunconditionally as the principal morbid appear-ances seen in the vessels in casesof apoplexy are as follows :—(1)Chronic arteritis, giving rise torigidity and brittleness of thewalls, from atheromatous or cal-careous deposits; (2) as a conse-quence of this condition aneu-rismal dilatations of the smallerarteries, which may be eithera ki
Manual of pathological anatomy . veway under one abnormally of the Vessels, — Amorbid condition of the coats ofthe vessels is, however, so muchthe most powerful factor in thecausation of apoplexy, that somepathologists have spoken of itunconditionally as the principal morbid appear-ances seen in the vessels in casesof apoplexy are as follows :—(1)Chronic arteritis, giving rise torigidity and brittleness of thewalls, from atheromatous or cal-careous deposits; (2) as a conse-quence of this condition aneu-rismal dilatations of the smallerarteries, which may be eithera kind of dissecting aneurismformed between the middle and the outer coat (lymphatic sheathof some writers), or else true aneurisms composed of all the coats;(3)^ simple fatty degeneration of the capillaries and small vessels,which is not always associated with atheromatous or other changesof the larger vessels; (4) a peculiar nuclear proliferation in thewall of the smaller arteries, sometimes seen in young persons(see Fig. 65).. Peri-arte4tis. Nuclear proliferation inthe outer coat or IjTnphatic sheath of acerebral artery from a child. This i«! the condition believed to pre-dispose to cerebral hsemorrhag-e; which,however, had not occurred in this case. (From an original preparation.) 260 H^MOREHAGE. Fig. 66. The changes inclnded in the term chronic arteritis will he spokenof under the general head of Diseases of the Arteries, but the occur-rence of anearisms of the cerebral arteries requires some considera-tion here. Intracranial Aneurisms.—Aneurisms of the same kind as thoseoccurring in other organs may of course occur in the cerebral arte-ries, and liave been seen, both at various points on the circleof Willis, and on branches within the brain.* They are generallyassociated with disease of the vessel, and hardl}^ ever occur inyoung persons. When associated with youth and healthy vessels,their formation is not easy to explain, but has been thought to bein some cases due to
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