The superior rectal artery normally proceeds in order to arrive at the behind the upper third of the rectum. At this moment, it splits into two vessels, adjacent to the lower portion of the pouch of Douglas as well as opposite the layer of S3. The bigger right section supplies the posterior along with lateral side of the rectum. It splits within two primary branches that diminish to the right anterior as well as posterior elements of the rectum.
The shorter left branch supplies the anterior side of the rectum and continues undistracted down the left lateral element of the rectum. These branches typically separate into shorter vessels that lastly permeate the muscle layer to reach the submucosa. Here they continue downward as straight vessels, which run in the columns of Morgagni and end normally above the anal valves as a capillary plexus.
The superior rectal artery is the extension of the inferior mesenteric artery. It comes down into the pelvis in between the layers of the mesentery of the sigmoid colon, going across the left common iliac artery and vein.
It splits, contrary the third sacral vertebra into two branches, which came down one on both side of the rectum. About 10 or 12 cm via the anus, these branches separate into a number of small branches.
These perforate the muscular coat of the bowel and run downwards, like straight vessels, positioned at routine periods via each other in the wall of the gut in between its muscular and mucous coats, to the level of the internal anal sphincter; right here they create a set of loops near the lower end of the rectum, as well as interact with the middle rectal artery (via the internal iliac artery) and along with the inferior rectal artery (via the internal pudendal artery).