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A circulatory anastomosis is a connection -LRB- an anastomosis -RRB- between two blood vessels , such as between arteries -LRB- arterio-arterial anastomosis -RRB- , between veins -LRB- veno-venous anastomosis -RRB- or between an artery and a vein -LRB- arterio-venous anastomosis -RRB- .. anastomosis. anastomosis. blood vessels. blood vessels. arteries. arteries. veins. veins. Anastomoses between arteries and between veins result in a multitude of arteries and veins , respectively , serving the same volume of tissue .. arteries. arteries. veins. veins. Such anastomoses occur normally in the body in the circulatory system , serving as backup routes for blood to flow if one link is blocked or otherwise compromised , but may also occur pathologically .. circulatory system. circulatory system