Rectal Plexus, Posterior View

Description

Posterior to the rectum, a dense rectal plexus spreads as an interlacing autonomic nerve network along the mesorectal fascia, continuing superiorly toward the sigmoid colon and inferiorly toward the pelvic floor. Fine nerve fibers course longitudinally and circumferentially over the posterior rectal wall, with small ganglionated enlargements consistent with pelvic splanchnic contributions and the hypogastric pathways. Laterally, the plexus sits where the rectum approaches the pelvic sidewall, a corridor shared with vessels and connective tissue that surgeons recognize as the plane of total mesorectal excision. Posterior views of the rectal plexus matter because this is where sympathetic fibers from the superior hypogastric plexus and parasympathetic pelvic splanchnic nerves (S2 to S4) mix before distributing to the rectum and internal anal sphincter, shaping rectal compliance, sensation, and continence. Injury here is not academic. Autonomic denervation during low anterior resection or abdominoperineal resection can contribute to postoperative bowel dysfunction and, in men, sexual dysfunction through nearby pelvic autonomic pathways, so recognizing the nerve-bearing fascia behind the rectum helps explain why staying in the correct mesorectal plane changes outcomes. Use this illustration in pelvic anatomy teaching blocks, colorectal surgery atlases, and manuscripts discussing rectal cancer staging, TME technique, or mechanisms of low anterior resection syndrome, where a clear posterior map of the rectal nerve plexus supports both anatomy and complication narratives. It also fits radiology or pathology handouts that correlate mesorectal planes with perirectal spread and neural involvement. Anatomical accuracy verified by SciePro's Medical Advisory Board.