Rectal venous plexus
The rectal venous plexus (or hemorrhoidal plexus) is the venous plexus surrounding the rectum. It consists of an internal and an external rectal plexus.: 598 : 294 It is drained by the superior, middle, and inferior rectal veins. It forms a portosystemic (portocaval) anastomosis. This allows rectally administered medications to bypassing first pass metabolism.
| Rectal venous plexus | |
|---|---|
Scheme of the anastomosis of the veins of the rectum. | |
The veins of the right half of the male pelvis. | |
| Details | |
| Drains to | Superior rectal vein, Middle rectal vein(s), Inferior rectal veins |
| Identifiers | |
| Latin | plexus venosus rectalis, plexus haemorrhoidalis |
| TA98 | A12.3.10.010 |
| TA2 | 5031 |
| FMA | 18933 |
| Anatomical terminology | |
Despite the inclusion of the term "rectal" into the name, the venous plexus is positionally, functionally, and clinically primarily related to the anal canal.
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