Ganglion impar

Last revised by Nak Hyun Kim on 6 May 2023

The ganglion impar, also know as the ganglion of Walther, is the midline autonomic ganglion located in the lower pelvis. It is the most distal convergence of the pelvic sympathetic chain which is usually located anterior to the coccyx.  It can be found anywhere between the sacrococcygeal joint and the tip of the coccyx and may occasionally be paired, unilateral or absent entirely.

The ganglion contains nociceptive afferent fibers from and sympathetic efferent fibers to the perineum and lower pelvic viscera including the distal rectum, distal urethra, vulva, scrotum, and distal third of the vagina 5.

Related pathology

ADVERTISEMENT: Supporters see fewer/no ads