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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 LAD artery supplies blood to the walls of both the left and right ventricles. The circumflex, follows a different course to the LAD. It runs along the atrioventricular groove, which seperates the atria from the ventricles, giving rise to the left marginal branch in the process.