Piriformis Contents Anatomy Piriformis - posterior Piriformis - lateral Piriformis - anterior Piriformis - posterolateral Position Deep Origin Anterior part of sacrum, between and lateral to 1.-4. sacral foramina Anterior surface of the sacrotuberous ligament Insertion Trochanter major femur, superomedially Main function Hip Lateral rotation Secondary function Hip Abduction Medial rotation Pelvis Contralateral rotation Nerve innervation Segmental L5-S2 Peripheral Plexus sacralis Arterial supply Superior gluteal artery Inferior gluteal artery Referred pain pattern Piriformis and deep lateral rotators - pain pattern Muscle type Postural Shortens when overactivated Symptoms Entrapment of sciatic nerve Paraesthesia lower back, groin, buttocks Si-joint dysfunction Problems and pain while defecating Pain during sexual intercourse (female) Impotence (man) Videos Short version Detailed version
