Anatomy MCQ 0006

One of the following is the watershed area of the colon between the superior and inferior mesenteric arteries:

1. Ascending colon
2. Hepatic flexure
3. Splenic flexure
4. Descending colon

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The Correct option is C

Explanation with High Yield Facts :

• The weakest link in the marginal chain of vessels (of Drummond) is near the left colic (splenic) flexure, between the middle colic artery (mid-gut) & the left colic artery (hind-gut).
• An inner arterial circle (of Riolan) between the ascending branch of left colic artery and the trunk of middle colic artery may supplement the blood supply to this region of colon.
• "Watershed area" is the medical term referring to regions of the body that receive dual blood supply from the most distal branches of two large arteries, such as the splenic flexure of the large intestine. During times of blockage of one of the arteries that supply of the watershed area, such as in atherosclerosis, these regions are spared from ischemia by virtue of their dual supply. However, during times of systemic hypoperfusion, such as in DIC or Heart failure, these regions are particularly vulnerable to ischemia by virtue of the fact that they are supplied by the most distal branches of their arteries, and thus the least likely to receive sufficient blood.

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