Piriformis

  • The piriformis (also piriformis muscle, latin: musculus piriformis) is a small skeletal muscle located in the gluteal region.

    Origin

    The piriformis originates in the lesser pelvis from the anterior surface of sacrum.

    Insertion

    The piriformis exits the lesser pelvis through the greater sciatic foramen and inserts at the great trochanter.

    Action

    The major functions of the piriformis are adduction and external rotation of the femur.

    Innervation

    The piriformis is innervated by the muscular branches of the sacral plexus.