Middle rectal veins
|Middle rectal veins|
Scheme of the anastomosis of the veins of the rectum
|Latin||venae rectales mediae|
|internal iliac vein|
|middle rectal artery|
They run lateralward on the pelvic surface of the levator ani to end in the internal iliac vein. Veins superior to the middle rectal vein in the colon and rectum drain via the portal system to the liver. Veins inferior, and including, the middle rectal vein drain into systemic circulation and are returned to the heart, bypassing the liver.
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