- Middle rectal veins
Vein: Middle rectal veins Scheme of the anastomosis of the veins of the rectum Latin venae rectales mediae Gray's subject #173 676 Drains from rectum Drains to internal iliac vein Artery 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.
Veins of the abdomen and pelvis (TA A12.3.09–10, 12, GA 7.672) To azygos system IVC
(Systemic)To IVC or left renal veinUnpairedinferior gluteal · obturator · uterine ♀ (uterine plexus ♀) · vesical (vesical plexus, prostatic plexus ♂, deep of penis ♂/clitoris ♀, posterior scrotal ♂/labial ♀) · vaginal plexus/vein ♀ · middle rectal · internal pudendal (inferior rectal, bulb of penis ♂/vestibule ♀) · rectal plexus
Wikimedia Foundation. 2010.