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Pudendal nerve

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Nerve: Pudendal nerve
Gray829
Dissection of side wall of pelvis showing sacral and pudendal plexuses. (Pudendal nerve labeled at center right.)
Gray837
Sacral plexus of the right side. (Inferior pudendal labeled at bottom right.)
Latin nervus pudendus
Gray's subject #213 967
Innervates
From sacral plexus
To inferior rectal nerves
perineal nerve
dorsal nerve of the penis
MeSH {{{MeshNumber}}}

The pudendal nerve is a nerve in the pelvic region that innervates the external genitalia of both sexes, as well as sphincters for the bladder and the rectum.

AnatomyEdit

The pudendal nerve originates in the sacral plexus; it derives its fibers from the ventral branches of the second, third, and fourth sacral nerves (S2, S3, S4).

It passes between the piriformis and coccygeus muscles and leaves the pelvis through the lower part of the greater sciatic foramen.

It crosses the spine of the ischium, and reenters the pelvis through the lesser sciatic foramen.

It accompanies the internal pudendal vessels upward and forward along the lateral wall of the ischiorectal fossa, being contained in a sheath of the obturator fascia termed the pudendal canal.

The pudendal nerve gives off the inferior anal nerves. It soon divides into two terminal branches: the perineal nerve, and the dorsal nerve of the penis (males) or the dorsal nerve of the clitoris (in females).

Branch Description
Inferior anal nerves given off shortly after passing through the Greater sciatic foramen.
Perineal nerve more superficial terminal branch
Dorsal nerve of penis/Dorsal nerve of clitoris deeper terminal branch, travelling into the deep perineal pouch

PhysiologyEdit

The pudendal nerve innervates the penis and clitoris, bulbospongiosus and ischiocavernosus muscles, and areas around the scrotum, perineum, and anus. At sexual climax, the spasms in the bulbospongiosus and ischiocavernous results in ejaculation in the male and most of the feelings of orgasm in both sexes.

PathologyEdit

Difficult childbirth or bicycling can compress or stretch the pudendal nerve but permanent injury is rare. Entrapment of the nerve is very rare but can happen. Pudendal Nerve Entrapment (PNE) is akin to Carpal Tunnel syndrome.

Additional imagesEdit

External linksEdit

de:Nervus pudendus
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