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Piriformis nerve
From Wikipedia, the free encyclopedia
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The piriformis nerve, also known as the nerve to piriformis, is the peripheral nerve that provides motor innervation to the piriformis muscle.
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Structure
Origin
The nerve to piriformis is a branch of the sacral plexus.[1][2] It (typically[3]) arises from the posterior divisions[4]/branches[3] of anterior rami of S1 and S2.[1][2][3][5]
Course
It enters the anterior surface of the piriformis muscle.[3][6]
Variation
Origin
It may sometimes arise from the anterior ramus of S2 only.[3]
Number
It may be doubled. An additional branch may arise from the superior gluteal nerve.[3]
Distribution
The piriformis nerve innervates the piriformis muscle.[1]
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See also
References
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