A system of surgery : pathological, diagnostic, therapeutic, and operative . its natural attributes, as seen in fig. 238. Theinevitable effect of these changes, which are always most con-spicuous in the inner coat, is to render the artery abnormally brit-tle, and, therefore, ill able to withstand the pressure of its con-tents. ^ The starting point of this deposit is the subserous cellulartissue, whence it gradually extends to the substance of the innerand middle tunics, both of which are sometimes completely trans-formed by it. It is rare that the outer coat suffers from it; sucha change, howe
A system of surgery : pathological, diagnostic, therapeutic, and operative . its natural attributes, as seen in fig. 238. Theinevitable effect of these changes, which are always most con-spicuous in the inner coat, is to render the artery abnormally brit-tle, and, therefore, ill able to withstand the pressure of its con-tents. ^ The starting point of this deposit is the subserous cellulartissue, whence it gradually extends to the substance of the innerand middle tunics, both of which are sometimes completely trans-formed by it. It is rare that the outer coat suffers from it; sucha change, however, is not impossible, and I have seen specimensin which the deposit was apparently entirely restricted to it. Theexciting cause of the calcareous transformation is chronic inflam-mation. That this is the case is rendered clearly manifest by thefact that it is invariably accompanied by more or less thickeningand induration of the arterial tunics, independently of those pro-duced by the deposit itself. The atheromatous deposit, fig. 239, now usually denominated Fig. Calcareousdeposits. Atheromatous deposits. the fatty degeneration, is, I believe, very rare among our nativeinhabitants, although it appears to be sufficiently common in ourimmigrants, especially the Irish and English. In Europe, it issaid to be more prevalent in Great Britain than in any othercountry ; a fact which accounts for the remarkable frequency ofaneuiism in that part of the world. However this may be, thedeposit always begins in the subserous cellular substance, generally in minute,isolated points, not larger than the head of a pin, of a pale yellowish, whitish,or brownish color, somewhat greasy to the touch, and of a semi-concrete, friableconsistence. In time, many of these points, or dots, coalesce, and so formirregular-shaped patches, which, pushing the lining membrane before them,may involve the whole circumference of the tube, and extend several lines oreven inches up and down in the direction o
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Keywords: ., bookcentury1800, booksubjectgeneralsurgery, booksubjectsurgery
