The Piriformis muscle is an important muscle. The sciatic nerve passes underneath this muscle on its route down to the posterior thigh. In some individuals the nerve can actually pass right through the muscle. This can lead to sciatica symptoms due to a condition known as piriformis syndrome


Origin

  • Anterior surface of the lateral sacrum


Insertion

  • Greater trochanter of the femur


Actions

  • External rotation of the hip
  • Hip abduction


Innervation

  • Branch of the sacral plexus


Daily uses

  • Taking the first leg out of the car


Example strengthening exercises

  • Hip extension with external rotation


Example stretches


Related injuries


Related muscles