| 释义 |
DictionarySeenervepudendal nerve
pu·den·dal nerve [TA] branch of the sacral plexus formed by fibers from the ventral primary rami of the second, third, and fourth sacral spinal nerves; it exits the pelvis via the greater sciatic foramen, passes posterior to the sacrospinous ligament, and accompanies the internal pudendal artery, into the perineum via the lesser sciatic foramen; it gives off inferior rectal nerves, then courses through the pudendal canal in the lateral wall of the ischiorectal fossa, terminating as the dorsal nerve of the penis or of the clitoris. Synonym(s): nervus pudendus [TA], plexus pudendus nervosus, pudic nervepu·den·dal nerve (pyū-den'dăl nĕrv) [TA] Formed by fibers from the ventral primary rami of the second, third, and fourth sacral spinal nerves; it exits the pelvis through the greater sciatic foramen, passes posterior to the sacrospinous ligament, and accompanies the internal pudendal artery into the perineum through the lesser sciatic foramen; it gives off inferior rectal nerves, then courses through the pudendal canal in the lateral wall of the ischiorectal fossa, terminating as the dorsal nerve of the penis or of the clitoris.
Synonym(s): nervus pudendus [TA] . pudendal nerveA mixed nerve composed of axons from spinal nerves S2–S4. It follows the sciatic nerve out of the pelvis but immediately reenters through the lesser sciatic foramen. It innervates most of the structures of the perineum: it is sensory to the genitals and motor to the perineal muscles, the external urethral sphincter, and the external anal sphincter. See also: nerve |