Pelvic splanchnic nerves

Pelvic splanchnic nerves
Details
From	S2-S4
Identifiers
Latin	nervi splanchnici pelvici; nervi erigentes
	Anatomical terms of neuroanatomy

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 anterior rami of the sacral spinal nerves S2-S4 and enter the sacral plexus.[1] They travel to their side's corresponding inferior hypogastric plexus, located bilaterally on the walls of the rectum.

Function

From there, they contribute to the innervation of the pelvic and genital organs. The nerves regulate the emptying of the urinary bladder, control opening and closing of the internal urethral sphincter, influence motility in the rectum as well as sexual functions like erection.[1]

They contain both preganglionic parasympathetic fibers as well as visceral afferent fibers. Visceral afferent fibers go to spinal cord following pathway of pelvic splanchnic nerve fibers.

In the distal 1/3 of the transverse colon, and through the sigmoid and rectum, and the cervix in females, the pelvic splanchnic nerves supply parasympathetic function, including transmitting the sensation of pain.[1] The proximal 2/3 of the transverse colon, and the rest of the proximal gastrointestinal tract is supplied its parasympathetic fibers by the vagus nerve.

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.

In popular culture

The pelvic splanchnic nerves are featured as a key plot point in "Parasites Lost", a 2001 episode of the American animated TV comedy Futurama; when protagonist Philip J. Fry is infected with parasitic worms, the rest of the crew use micro-droids to enter his body with the intention of tickling the pelvic splanchnic ganglion to trigger a convulsive bowel movement that they believe will expel the worms.

References

Drake, Richard L.; Vogl, Wayne; Tibbitts, Adam W.M. Mitchell; illustrations by Richard; Richardson, Paul (2005). Gray's anatomy for students. Philadelphia: Elsevier/Churchill Livingstone. p. 423. ISBN 978-0-8089-2306-0.

External links

Anatomy photo:43:15-0107 at the SUNY Downstate Medical Center
Autonomics of the Abdomen - Page 7 of 16 anatomy module at med.umich.edu
figures/chapter_32/32-6.HTM: Basic Human Anatomy at Dartmouth Medical School
pelvis at The Anatomy Lesson by Wesley Norman (Georgetown University) (pelvicnerves)

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[GRAYS2005-1] Drake, Richard L.; Vogl, Wayne; Tibbitts, Adam W.M. Mitchell; illustrations by Richard; Richardson, Paul (2005). Gray's anatomy for students. Philadelphia: Elsevier/Churchill Livingstone. p. 423. ISBN 978-0-8089-2306-0.