anastomosis /anas·to·mo·sis/ (ah-nas″tah-mo´sis) pl. anastomo´ses [Gr.]
arteriovenous anastomosis
anastomosis [ah-nas″to-mo´sis] (pl. anastomo´ses) (Gr.)
1. communication between vessels by collateral channels.
2. surgical, traumatic, or pathological formation of an opening between two normally distinct spaces or organs.anastomot´ic
arteriovenous anastomosis one between an artery and a vein. 
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Arteriovenous anastomosis.
crucial anastomosis an arterial anastomosis in the upper part of the thigh.
end-to-end anastomosis
1. one connecting the end of an artery and that of some other vessel.
2. anastomosis of two sections of colon, as with partial colectomy or closure of an ileostomy.
end-to-side anastomosis an anastomosis connecting the end of one vessel with the side of a larger one.
heterocladic anastomosis one between branches of different arteries.
homocladic anastomosis one between two branches of the same artery.
ileoanal pull-through anastomosis anastomosis of an ileoanal reservoir to the anal canal by means of a short conduit of ileum pulled through the rectal cuff and sutured to the anus, allowing continent elimination of feces following colectomy.
intestinal anastomosis establishment of a communication between two formerly distant portions of the intestine.
anastomosis of Riolan anastomosis of the superior and inferior mesenteric arteries.
Roux-en-Y anastomosis any Y-shaped anastomosis in which the small intestine is included. 
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Roux-en-Y anastomosis
| arteriovenous anastomosis n. A vessel that shunts blood from an artery to a vein in order to bypass a capillary. |
arteriovenous anastomosis
Etymology: Gk, arteria + L, vena; Gk, anastomoein, to form a mouth
a communication between an artery and a vein, either as a congenital anomaly or as a surgically produced link between vessels.
anastomosis [ah-nas″to-mo´sis] (pl. anastomo´ses) (Gr.)
1. communication between two tubular organs.
2. surgical, traumatic, or pathologic formation of a connection between two normally distinct structures. adj., adj anastomot´ic.
arteriovenous anastomosis
anastomosis between an artery and a vein.
Simple arteriovenous anastomosis. From Dorland's, 2000.
crucial anastomosis an arterial anastomosis in the upper part of the thigh, formed by the anastomotic branch of the sciatic artery, the internal circumflex artery, and the first perforating and transverse portions of the external circumflex artery.
end-to-end anastomosis
1. an anastomosis connecting the end of an artery and that of some other vessel, either directly or with a synthetic graft.
2. anastomosis of two sections of colon, such as with partial colectomy or when an ileostomy is closed.
end-to-side anastomosis an anastomosis connecting the end of one vessel with the side of a larger one.
heterocladic anastomosis one between branches of different arteries.
ileorectal anastomosis surgical anastomosis of the ileum and rectum after total colectomy, as is sometimes performed in the treatment of ulcerative colitis.
intestinal anastomosis establishment of a communication between two formerly distant portions of the intestine.
anastomosis
1. communication between two tubular organs.
2. surgical, traumatic or pathological formation of a connection between two normally distinct structures.
arteriovenous anastomosis
anastomosis between an artery and a vein.
cobra-head anastomosis
a technique used in joining grafts to blood vessels. Ends of grafts are trimmed to form an enlarged lumen.
esophageal anastomosis
uniting the free ends after complete resection of a part of the esophagus.
heterocladic anastomosis
one between branches of different arteries.
intercarotid anastomosis
a naturally occurring communication between the internal and external carotid arteries in birds. It provides a collateral pathway for blood to the brain, the counterpart of the cerebral arterial circle of Willis in mammals.
intestinal anastomosis
establishment of a communication between two formerly distinct portions of the intestine.
skin arteriovenous anastomosis
frequent natural occurrence; capable of diverting large volumes of blood to splanchnic circulation during cardiovascular stress.
tracheal anastomosis
end-to-end anastomosis of the trachea after resection of a part.
ureterocolonic anastomosis
see ureterocolostomy.
arteriovenous
both arterial and venous; pertaining to both artery and vein.
arteriovenous anastomosis
a direct connection between an artery and a vein that acts as a shunt to bypass the capillary bed. These occur in areas where a high volume blood supply is needed only intermittently, e.g. the intestine.
arteriovenous fistula
an abnormal communication between an artery and a vein; includes cardiac defects such as ventricular septal defects and patent ductus arteriosus. Peripheral fistulae, especially in the extremities, may be localized, usually acquired and the result of trauma, while congenital defects tend to be more diffuse, involving a network of anastomosing vessels.
The effects of arteriovenous fistulae are variable, depending on their location and the amount of blood carried. Within the liver they usually connect the hepatic artery and portal vein, causing portal hypertension and ascites. Small peripheral fistulae may be noticeable only as warm, reducible swellings, often with an audible thrill, or give rise to edema distal to the site. More severe effects are also possible.
pulmonary arteriovenous fistula
a congenital anomalous communication between the pulmonary arterial and venous systems, allowing unoxygenated blood to enter the systemic circulation.
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