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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 of the Midbrain and Pons. The basilar component of the vertebrobasilar system spans the length of the pons. It commences at the inferior pontine sulcus, where the left and right vertebral arteries unite, and bifurcates into the left and right posterior cerebral arteries at the superior pontine sulcus.