Middle rectal veins

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Vein: Middle rectal veins
Gray587.png
Scheme of the anastomosis of the veins of the rectum
Latin venae rectales mediae
Gray's p.676
Drains from rectum
Drains to internal iliac vein
Artery middle rectal artery

The middle rectal veins (or middle hemorrhoidal vein) take origin in the hemorrhoidal plexus and receive tributaries from the bladder, prostate, and seminal vesicle.

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.

This article incorporates text from a public domain edition of Gray's Anatomy.