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|Nerve: Pudendal nerve|
|Dissection of side wall of pelvis showing sacral and pudendal plexuses. (Pudendal nerve labeled at center right.)|
|Sacral plexus of the right side. (Inferior pudendal labeled at bottom right.)|
|Gray's||subject #213 967|
|To||inferior rectal nerves|
dorsal nerve of the penis
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).
|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|
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.
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.
- SUNY Figs 41:04-11 - "Inferior view of female perineum, branches of the internal pudendal artery."
- Human anatomy at Dartmouth figures/chapter_32/32-2.HTM
- Human anatomy at Dartmouth figures/chapter_32/32-3.HTM
- Cross section at UV pelvis/pelvis-female-17
lumbar plexus: iliohypogastric - ilioinguinal - genitofemoral (femoral branch/lumboinguinal, genital branch) - lateral cutaneous of thigh (patellar) - obturator (anterior, cutaneous, posterior, accessory) - femoral (anterior cutaneous branches, saphenous)
sacral/coccygeal plexus: to quadratus femoris - to obturator internus - to the piriformis - superior gluteal - inferior gluteal - posterior cutaneous of thigh (inferior cluneal, perineal branches)
sciatic: tibial (medial sural cutaneous, sural, medial calcaneal, medial plantar, lateral plantar) - common fibular (lateral sural cutaneous, deep fibular, superficial fibular, medial dorsal cutaneous, intermediate dorsal cutaneous)
- de:Nervus pudendus
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