surrounds
surrounds
rectum
venous plexus
rectal venous plexus
http://upload.wikimedia.org/wikipedia/commons/6/69/Gray587.png
FMA:18933
Wikipedia:Rectal_venous_plexus
plexus venosus rectalis
SCTID:303051005
UBERON:0008887
UMLS:C0226766
NCIT:C32728
The hemorrhoidal plexus (or rectal venous plexus) surrounds the rectum, and communicates in front with the vesical venous plexus in the male, and the uterovaginal plexus in the female. A free communication between the portal and systemic venous systems is established through the hemorrhoidal plexus.
hemorrhoidal plexus
uberon
haemorrhoidal plexus
plexus haemorrhoidalis