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 haemorrhoidal plexus plexus haemorrhoidalis