The science and art of surgery : being a treatise on surgical injuries, diseases, and operations . ^ involve the external coat, or may be deposited inplastic masses on the lining membrane. Effects.—The most important consequence of these clianges in thestructure of the artery is the effect produced upon its vital of being an elastic resilient tube, reacting on the contained bloodand serving to regulate its distribution, it becomes inelastic, and conse-quently either gradually dilates in its calibre under the influence of tlieoutward pressure of the blood contained within it,
The science and art of surgery : being a treatise on surgical injuries, diseases, and operations . ^ involve the external coat, or may be deposited inplastic masses on the lining membrane. Effects.—The most important consequence of these clianges in thestructure of the artery is the effect produced upon its vital of being an elastic resilient tube, reacting on the contained bloodand serving to regulate its distribution, it becomes inelastic, and conse-quently either gradually dilates in its calibre under the influence of tlieoutward pressure of the blood contained within it, forming perhaps ananeurism ; or, being incapable of regulating the distribution of the vitalfluid, tends to impair the supply to the organs to which it leads, and thus CALCIFICATION OF ARTERIES. 25 may occasion impairment of nutrition leading to softening, disintegra-tion, or Fig. 348.—a. External Coat. h. Middle Coat. c. Internal Coat. e. Sclerosing Layer of Inner Coat, showing abundant Cell-proliferation. c. Atheromatous Matter derived from Fatty Metamorphosis of Proliferated Cells, Oily Debris, soft-ened Tissue-elements, and Deepest layers of Inner Coat, fatty but not wholly disintegrated. 3. Calcification of Arteries comes next in order of frequency totheir fatty disintegration. This change consists in the deposit in theircoats of a quantity of hard and gritty eartliy and saline matters, which,though commonly called osseous, present none of the true characters ofbone—no trace of bone-corpuscles or of vascular canals being ever trace-able in them. Microscopical examination shows them to consist of anirregular crystalline granular mass, without any evidence of organiza-tion, composed, according to Lassaigne, of 50 parts of animal matter,47^ of tlie phospliate, and 2 of the carbonate of lime in every 100. Thiscalcification of tlie arte
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Keywords: ., bookcent, bookdecade1870, booksubjectsurgicalproceduresoperative
