. The elements of pathological histology with special reference to practical methods . to a connective tissue which becomes progressively poorerin cells and firmer, it produces the well-known thickenings, adhesionsand shrinkages of the valve-curtains and chordae tendineae, whichmay lead to insufficiency of the valvylar apparatus. The phase ofthe process last described is termed by many chronic endocarditis,under which designation is usually included also the extension of achronic endarteritis (p. 204) to the valves. We may meet with thromhotic deposits upon the valves in othercases also apart
. The elements of pathological histology with special reference to practical methods . to a connective tissue which becomes progressively poorerin cells and firmer, it produces the well-known thickenings, adhesionsand shrinkages of the valve-curtains and chordae tendineae, whichmay lead to insufficiency of the valvylar apparatus. The phase ofthe process last described is termed by many chronic endocarditis,under which designation is usually included also the extension of achronic endarteritis (p. 204) to the valves. We may meet with thromhotic deposits upon the valves in othercases also apart from endocarditis, and especially in marastic in-dividuals, and upon parts of the valves which are irregular, thickened,or otherwise altered. These thrombi (Fig. 98), moreover, show asimilar structure to those in endocarditis, except that they are invari-ably free from bacteria, and that consequently the tissue of the valve 198 THE HEART AND PERICARDIUM under them shows neither necrotic nor inflammatory changes. Theymay, however, likewise become organised when they have existed for. I -^s ^r^i^i Fig. 9S.—Thrombus on an Aortic Valve, due to Marasmus, in process of organisa-tion. Low power (x 65). (Alum cochineal.) a, Thrombus, composed of blood-platesand leucocytes ; 6, Valve-tissue growing into the thrombus. a considerable time, the valvular tissue growing into (Fig. 99) andgradually replacing them.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpatholo, bookyear1895
