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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.
Vascular supply. The splenic artery supplies blood to the spleen. This artery is the largest branch of the celiac trunk and reaches the spleen's hilum by passing through the splenorenal ligament. It divides into multiple branches at the hilum.ilum of the spleen along with anatomy of the splenic artery (a) and the splenic vein (v). Spleen anatomy. This section shows the spleen's red pulp and the white pulp and its relation to the liver and diaphragm.