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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.
The celiac artery supplies blood and nutrients to the spleen and other organs. The left gastric artery branches upward and supplies the top portion of the stomach along its lesser curvature. A diagram of the aorta, including the celiac trunk, which is also called the celiac artery. View slideshow of images above.