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Related to rectal plexus: Rectal bleeding
1. Any of three autonomic nerve plexuses — superior, middle, and inferior — innervating the rectum. The rectal plexuses are extensions of the inferior hypogastric plexus and they follow the three corresponding rectal arteries.
2. Any of three venous plexuses — external, internal, and superior — in and around the rectum. The external rectal plexus empties via the internal rectal vein, into the internal pudendal vein; the internal and the superior rectal plexuses empty into the superior rectal vein. When veins in the internal rectal plexus develop varices, the varicose segments are called "hemorrhoids." Synonym: hemorrhoidal plexus
See also: plexus