This site is intended for healthcare professionals
Login | Register (NOW FREE)

Medical search

piriformis muscle (anatomy)

FREE subscriptions for doctors and students... click here
You have 3 open access pages.

Piriformis is one of the muscles of the gluteal region. It is located both within the pelvis and posterior to the hip joint.

It originates from the second to fourth lateral masses of the sacrum on its anterior surface and the adjoining sacrotuberous ligament. It passes laterally to exit the pelvis through the greater sciatic foramen. Lying posterior to the femoral head, it inserts into the superior and medial border of the greater trochanter of the femur.

It is innervated by the anterior primary rami of S1 and S2.

Piriformis has many functions:

  • lateral rotation of the thigh in the extended position
  • abduction of the flexed thigh
  • stabilization of the hip joint


The information provided herein should not be used for diagnosis or treatment of any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions. Copyright 2016 Oxbridge Solutions LtdĀ®. Any distribution or duplication of the information contained herein is strictly prohibited. Oxbridge Solutions LtdĀ® receives funding from advertising but maintains editorial independence. GPnotebook stores small data files on your computer called cookies so that we can recognise you and provide you with the best service. If you do not want to receive cookies please do not use GPnotebook.