[TA] portion of the autonomic nerve plexuses that extend into and lie within the lesser pelvis, i.e., inferior to the plane of the pelvic inlet; included are the superior and inferior hypogastric plexuses, and the plexuses of the pelvic viscera: middle and inferior rectal, vesical, uterovaginal, prostatic and deferential; although technically they leave the pelvis and course within the erectile bodies of the perineum, the cavernous nerves of the penis and clitoris are also included. SYN: pars pelvica plexuum et gangliorum visceralium [TA].