The marginal artery of the colon, or artery of Drummond, is an artery that runs along the mesenteric border of the colon, ending at the rectum. The blood vessel connects the inferior mesenteric artery to the superior mesenteric artery and is formed from branches of the right colic, left colic, ileocolic and middle colic.
Together, Drummond's artery and the internal iliac arteries carry oxygenated blood to the large intestine. In situations in which the internal iliac arteries are not capable of supplying blood to the intestine (such as abdominal aortic aneurysm repair), the marginal artery of the colon is large enough to perform this function on its own.
In occasional anatomical variances, the marginal artery of Drummond is absent from the intestinal area. When this occurs, the internal iliac arteries carry blood by themselves. Another variance occurs when the marginal artery of the colon branches off to the middle colic artery. Such variances are quite rare, and their causes are unknown.