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Pelvic Splanchnic Nerves

nervi splanchnici pelvici

The pelvic splanchnic nerves (nervi erigentes) are preganglionic parasympathetic fibres arising from the ventral rami of S2, S3, and S4. They leave the sacral anterior foramina and join the inferior hypogastric plexus, from which postganglionic parasympathetic fibres distribute to the pelvic organs including the bladder, rectum, uterus, vagina, and erectile tissues of the penis and clitoris.

Region: Pelvis & Hip

Clinical Relevance

Clinical Notes

The pelvic splanchnic nerves are the source of the erection reflex (nervi erigentes) and supply parasympathetic innervation to the bladder detrusor (promoting micturition) and the distal colon and rectum (promoting defecation). Injury during rectal surgery, radical prostatectomy, and hysterectomy causes urinary retention, erectile dysfunction, and defecation difficulty. The nerve-sparing technique in radical prostatectomy specifically preserves the neurovascular bundles carrying pelvic splanchnic fibres lateral to the prostate.

Pathology

Common Injuries & Conditions

Nerve-Sparing Prostatectomy Deficit

Injury to the pelvic splanchnic nerves in the neurovascular bundles lateral to the prostate during radical prostatectomy causes erectile dysfunction in up to 30-70% of patients depending on the degree of nerve sparing, with recovery occurring over 12-24 months as the injured nerves regenerate.

Post-Rectal Surgery Bladder Dysfunction

Disruption of pelvic splanchnic fibres during total mesorectal excision for rectal cancer produces urinary retention from detrusor denervation, requiring temporary catheterisation and pelvic floor rehabilitation.