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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 Inferior Mesenteric Artery. The inferior mesenteric artery (IMA) is a major branch of the abdominal aorta. It supplies arterial blood to the organs of the hindgut â the distal 1/3 of the transverse colon, splenic flexure, descending colon, sigmoid colon and rectum. In this article, we shall look at the anatomy of the inferior mesenteric artery â its anatomical position, major branches and clinical correlations.