Arterial supply of the ascending colon comes from the ileocolic artery and right colic artery, both branches of parasite and colon cleanse the SMA. While the ileocolic artery is almost always present, the right colic can be AWOL in 5-15% of individuals.
The proximal two-thirds of the transverse colon is perfused by the between colic artery, a branch of superior mesenteric artery, while the latter third is supplied by branches parasite and colon cleanse of the inferior mesenteric artery. The "watershed" distance between these two blood supplies, which represents the embryologic detaching between the midgut and hindgut, is an area sensitive to ischemia.