Intestinal (Jejunoileal) Branches
Inferior Pancreaticoduodenal Artery
Middle Colic Artery
Right Colic Artery
Ascending Branch of the Ileocolic Artery
The Superior Mesenteric artery arises from the abdominal aorta at the level of L1. The named branches of the superior mesenteric have right and left or ascending and descending branches, which contribute to arcade formation. The Intestinal (Jejunoileal) Branches course across the left body wall to supply the jejunum and the ileum. The intestinal branches form a series of arcades (primary, secondary, tertiary) from which arise the terminal Vasa Rectae. The Inferior Pancreaticoduodenal artery, typically the first branch, or alternately arising from the first or second intestinal branch, anastomoses with the superior pancreaticoduodenal arteries (celiac trunk) to form the pancreatic arcades. The Middle Colic artery deviates to the right and traverses the transverse mesocolon. It anastomoses with the left and right colic arteries to complete the marginal artery (Drummond). The Right Colic, and Ileocolic arteries course across the right posterior body wall. The right colic artery arises with equal frequency from the superior mesenteric, middle colic, and ileocolic arteries. Independent of its origin it supplies the upper two thirds of the ascending colon. The ileocolic artery supplies the cecum, ileum, appendix, and ascending colon. The ileocolic artery allows the superior mesenteric artery to anastomose its left and right branches. Additionally, the marginal artery is initiated by the Ascending Branch of the Ileocolic artery. The Appendicular artery arises from either the ileocolic, or its Anterior-Posterior Cecal Branches.