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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.
Blood Supply to the Spleen. The spleen's blood is supplied by the splenic artery. This artery is one of the three large arteries that branch out from the celiac trunk (also called the celiac artery). The celiac trunk is the first major branch coming from the abdominal aorta. 1  Abdominal Aorta.  Celiac Artery (Celiac Trunk)