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| Nerve: Pelvic splanchnic nerves | |
|---|---|
| Latin | nervi pelvici splanchnici nervi erigentes |
| From | S2-S4 |
Pelvic splanchnic nerves or nervi erigentes are splanchnic nerves that arise from sacral spinal nerves S2, S3, S4 to provide parasympathetic innervation to the hindgut.
Structure
The pelvic splanchnic nerves arise from the ventral rami of the S2-S4 and enter the sacral plexus. They travel to their side's corresponding inferior hypogastric plexus, located bilaterally on the walls of the rectum.
From there, they contribute to the innervation of the pelvic and genital organs. The nerves regulate the emptying of the urinary bladder and the rectum as well as sexual functions like erection.
They contain both preganglionic parasympathetic fibers as well as visceral afferent fibers.
The parasympathetic nervous system is referred to as the craniosacral outflow; the pelvic splanchnic nerves are the sacral component. They are in the same region as the sacral splanchnic nerves, which arise from the sympathetic trunk and provide sympathetic efferent fibers.
Proximal 2/3 transverse colon, the gastrointestinal tract is supplied its parasympathetic fibers by the vagus nerve. Distal 1/3, the pelvic splanchnic nerves take over.
See also
External links
- Pelvic+splanchnic+nerves at eMedicine Dictionary
- SUNY Labs 43:15-0107
- Anatomy at UMich autonomics_abdomen_module/abdomen_07
- Human anatomy at Dartmouth figures/chapter_32/32-6.HTM
- Norman/Georgetown pelvis (pelvicnerves)
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- This page was last modified on 24 June 2008, at 16:59.
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