ANASTOMOSES University of Pennsylvania Certain types of direct connections between arteries and veins by passagesor openings greater than the diameter of a capillary, through which blood is carried without opportunity for interchange with extravascular fluids, have long been known to the clinician and pathologist. They are rare, may be properly considered pathological, and occur chiefly as a result of injury, developmental anomaly, or in vascular neoplasms. Most definite are the anastomosesresulting from stab or bullet wounds or crushing blows in which the walls of both an artery and a nearby vein are cut or broken open, permitting blood from the artery to pass directly into the vein, with the formation of a connection which may be permanent. Definite also aIre certain tumors, some following injury, others developing appa!rently spontaneously, in which there may be a number of direct anastomoses between arteries and veins, sometimeswith large, coiled arteries and still wider veins. These special types of anastomoses have been extensively reviewed by Callander (1920), and Reid (1925), and will not be treated further in this review, which will concern itself principally with the question of connections which may occur normally. According to the well-established views regarding the physiology of
Physiological Reviews – The American Physiological Society
Published: Apr 1, 1938
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