Nerve to piriformis
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At the time the article was created Chamath Ariyasinghe had no recorded disclosures.
View Chamath Ariyasinghe's current disclosuresAt the time the article was last revised Daniel J Bell had no financial relationships to ineligible companies to disclose.
View Daniel J Bell's current disclosures- Piriformis nerve
- Nerves to piriformis
- Piriformis nerves
Nerve to the piriformis muscle, also known as the piriformis nerve, arises from the S1 and S2 nerve roots of the sacral plexus. The nerve supplies the piriformis muscle.
Gross anatomy
Origin
The nerve to the piriformis muscle arises from the sacral plexus. The nerve branches from the posterior division of the ventral rami of the first and second sacral nerves. The piriformis occasionally receives a branch from the fifth lumbar nerve.
Course
Unlike the majority of nerves that originate from the sacral plexus the nerve to piriformis remains within the pelvic cavity and pierces the anterior surface of the piriformis muscle.
Relations
The sciatic nerve is the largest branch of the sacral plexus and at its origin is closely related to the piriformis muscle. The nerve which receives contributions from L4-S3 forms on the anterior surface of the piriformis muscle and leaves the pelvic cavity through the greater sciatic foramen inferior to piriformis.
Additionally, a number of small nerves that branch from the sacral plexus remain within the pelvic cavity, for example nerves that supply levator ani and coccygeus muscles.
References
- 1. Last's anatomy, regional and applied. Churchill Livingstone. ISBN:044304662X. Read it at Google Books - Find it at Amazon
- 2. FAAA RDP, FAAA AWVP, FRCR AWMMMBBSFRCS. Gray's anatomy for students. Churchill Livingstone. ISBN:0443066124. Read it at Google Books - Find it at Amazon
- 3. Saadeh FA. A bifid piriformis muscle with dual insertion. Gegenbaurs Morphol Jahrb. 1988;134 (2): 185-7. Pubmed citation
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