A 70-year-old man has a 90% blockage at the origin of the
inferior mesenteric artery. He does not have intestinal angina.
Which of the following arteries is the most likely additional
source of blood to the descending colon?
(A) Left gastroepiploic
(B) Middle colic
(C) Sigmoid
(D) Splenic
(E) Superior rectal

Option B

Middle colic arteries is the most likely additional  source of blood to the descending colon

The middle colic artery is a section of the superior mesenteric artery. Middle Colic provides the transverse colon, has a branch that runs to the right colon and branch that persists to the left colon that catches up with the left colic artery and proceeds as the marginal artery to provide the descending colon.

The left gastroepiploic artery is one of the sections of the splenic artery. Sigmoid- branch off IMA so barred in this case Splenic- proceeds of the celiac trunk, branches accumulation spleen & pancreas Superior Rectal- a sequence of IMA not possible to participate in this case

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