left piriformis
Muscular systemPelvisLeftFMA22341
Nomenclature
left piriformis
musculus piriformis (Latin)
muscolo piriforme sinistro (Italian)
Descriptionentry
Pelvitrochanteric muscle leaving the pelvis through the greater sciatic foramen.
Functionentry
Lateral rotation and abduction of the flexed hip; stabilises the femoral head.
Originentry
Pelvic surface of the sacrum, around the anterior sacral foramina.
Insertionentry
Superior border of the greater trochanter.
Innervationentry
Direct branches of the sacral plexus (S1-S2).
Blood supplyentry
Gluteal arteries.
Clinical notes
Direct relationship with the sciatic nerve: the anatomical basis of piriformis syndrome.
Part of
Related structures
Model