Middle rectal veins

Middle rectal veins
Scheme of the anastomosis of the veins of the rectum
Details
Drains from	rectum
Drains to	internal iliac vein
Artery	middle rectal artery
Identifiers
Latin	venae rectales mediae
TA	A12.3.10.018
FMA	70912
*Anatomical terminology* [edit on Wikidata]

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.

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

Veins of the abdomen and pelvis

To azygos system

ascending lumbar
- subcostal

IVC
(Systemic)

To IVC or left renal vein

Common iliac

Unpaired

median sacral vein

Internal iliac

posterior:	iliolumbar superior gluteal lateral sacral

anterior:	inferior 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

External iliac

Portal vein
(Portal)

Splenic	short gastric left gastroepiploic pancreatic inferior mesenteric superior rectal left colic

Superior mesenteric	right gastroepiploic pancreaticoduodenal jejunal ileal middle colic right colic ileocolic appendicular

Direct	cystic left gastric/esophageal right gastric paraumbilical

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