Question

The inferior mesenteric artery (IMA) must of necessity be ligated (occluded; tide off) during removal of an aneurysm of the abdominal aorta. The IMA normally supplies arterial blood to the sigmoid colon and rectum. Under most circumstances, the sigmoid colon and rectum survive such a ligation. How do they survive? Be sure to discuss

what occurs after the IMA is ligated to keep the sigmoid colon and rectum alive.

Answer 1