Marginal-the marginal artery is an important anastomosis for the large intestine. it runs around the border of the large intestine, and it is formed by the anastomosis of branches of the ileocolic artery, right colic artery, middle colic artery, left colic artery, and sigmoid artery. if a small artery becomes occluded, these branches allow blood to reach all segments of the colon. arcades are anastomotic loops between arteries that provide alternative pathways for blood flow. these arcades are more prominent in the small intestine than the large intestine. arteriae rectae (straight arteries) are the small branches that run from the marginal artery to reach the colon. the ileocolic artery is the branch of the superior mesenteric artery that supplies the cecum, appendix, and terminal portion of the ileum. the coronary arteries supply blood to the heart, but just to confuse things, the gastric veins are refered to as coronary veins, because they crown the lesser curvature of the stomach.
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