Median sacral artery

The median sacral artery (or middle sacral artery) is a small vessel that arises posterior to the abdominal aorta and superior to its bifurcation.The iliac veins.Scheme of the anastomosis of the veins of the rectum.The relations of the viscera and large vessels of the abdomen.Median sacral arteryPelvic contents: male. Superior view. Deep dissection. The median sacral artery (or middle sacral artery) is a small vessel that arises posterior to the abdominal aorta and superior to its bifurcation. It descends in the middle line in front of the fourth and fifth lumbar vertebræ, the sacrum and coccyx, ending in the glomus coccygeum (coccygeal gland). Minute branches pass from it, to the posterior surface of the rectum. On the last lumbar vertebra it anastomoses with the lumbar branch of the iliolumbar artery; in front of the sacrum it anastomoses with the lateral sacral arteries, sending offshoots into the anterior sacral foramina. It is crossed by the left common iliac vein and accompanied by a pair of venæ comitantes; these unite to form a single vessel that opens into the left common iliac vein.