The IMA is ligated (occluded) when removing an aneurysm of the abdominal aorta. The IMA normally...

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Medical Sciences

The IMA is ligated (occluded) when removing an aneurysm of theabdominal aorta. The IMA normally supplies arterial blood to thesigmoid colon and rectum. Uusualy, the sigmoid colon and rectumsurvive such a ligation. How do they survive? discuss the normalblood supply to the entire GI tract (in chart/table form,with names of arteries and names of corresponding structures), andthen what occurs after the IMA is ligated to keep the sigmoid colonand rectum alive.

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