The majority of piriformis muscles are innervated by the superior gluteal nerve

@article{Iwanaga2019TheMO,
  title={The majority of piriformis muscles are innervated by the superior gluteal nerve},
  author={Joe Iwanaga and Seif Eid and Emily A. Simonds and Maia Schumacher and Marios Loukas and R. Shane Tubbs},
  journal={Clinical Anatomy},
  year={2019},
  volume={32}
}
The piriformis muscle is clinically implicated in pain disorders, posterior approaches for total hip arthroplasty, and iatrogenic injury to the muscle and the surrounding nerves. The piriformis muscle has been said to receive innervation from L5 to S3 ventral rami with most sources using S1 and S2 ventral rami as the most common innervation this muscle. However, descriptions of the nerve in the literature are vague. Therefore, the aim of this study was to clarify the anatomy of the nerve supply… 

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Previously Unreported Sciatic Nerve Variation: Case Report.

An unusual relationship between the sciatic nerve and Piriformis muscle is reported in which the split common fibular nerve went through the piriformis and had a variant communication with the tibial nerve.

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