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