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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.
It may divide into two branches that reunite, the splenic vein passing through the loop thus formed. It may give rise to branches normally derived from other vessels, such as the left gastric, middle colic, and left hepatic. The splenic artery supplies four to six (more or less) gastric vasa brevia arteries.These are terminal or end arteries. It can arise from the gastroepiploic artery, the splenic artery proper, the splenic branches of the splenic artery, or any combination thereof.The left gastroepiploic artery may originate from one of the splenic branches, rather than from the splenic artery proper.t may divide into two branches that reunite, the splenic vein passing through the loop thus formed. It may give rise to branches normally derived from other vessels, such as the left gastric, middle colic, and left hepatic. The splenic artery supplies four to six (more or less) gastric vasa brevia arteries.