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An anatomical structure or structures (especially a blood vessel) taking the form of a series of arches. [L. arcus, arc, bow]
anomalous mitral a. short chordae tendineae extending from both papillary muscles to the central portion of the anterior leaflet of the mitral valve and resulting in stenosis or incompetence of the valve.
arterial a.'s a series of anastomosing arterial arches, as the intestinal arterial a.'s between the branches of the jejunal and ileal arteries in the mesentery and the pancreaticoduodenal arteries on the head of the pancreas.
Flint's a. a series of vascular arches at the bases of the pyramids of the kidney.
intestinal arterial a.'s the series of arterial arches formed in the mesentery by anastomoses between adjacent jejunal and ileal arteries and from which vasa recta arise. The arterial a.'s of the ileum are shorter and more complex than those of the jejunum. See also arterial arches of ileum, under arch, arterial arches of jejunum, under arch.intermesenteric arterial anastomosis, Riolan's arc (1) , Riolan's a.'s;
pancreaticoduodenal arterial a.'s anastomoses between the anterior and posterior pancreaticoduodenal arteries (from the gastroduodenal artery) and the anterior and posterior inferior pancreaticoduodenal arteries (from the superior mesenteric artery) on the anterior and posterior aspects of the head of the pancreas and the duodenum, supplying both structures.
Riolan's a.'s intestinal arterial a.'s See also Riolan's anastomosis.
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