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The blood supply to the colon comes from the superior and inferior mesenteric arteries. Part of the rectum is supplied by the internal iliac system and this anastamoses with the lower branches of the inferior mesenteric system.
Left gastric artery. Splenic artery. Hepatic artery. the first branch of the coeliac artery that is covered with tough connective tissue, ascending to the liver where it subdivides into serveral hepatic branches that supply the lobes of the liver and the cystic artery that lies on the surface of the cystic duct.