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Piriformis

Other Terms: M.piriformis, Musculus piriformis, Muscle piriforme

Muscle parts

None

Latin name

Musculus piriformis

Latin muscle parts

None

Group

Hip joint muscle – deep hip rotator group

Etymology

The English name for this muscle is the pear-shaped muscle. The word piriformis comes from the Latin words pirum meaning “pear” and forma meaning “form or shape.”

Origin

Anterior surface of the sacrum between the anterior sacral foramina; external surface of posterior iliac spine and the capsule of the sacro-iliac joint.

Insertion

Medial side of the superior border of greater trochanter of the femur.

Action

Lateral rotation of the extended thigh; abducts the flexed thigh.

Nerve supply

Nerve to piriformis (S1 and S2), sometimes contributions from L5

Blood supply

The inferior gluteal, superior gluteal, internal pudendal, and lateral sacral arteries, all arising from the internal iliac artery, supply the pelvic surface of the muscle. The lateral and medial circumflex femoral arteries, from the femoral artery, supply the muscle after it exits the sciatic notch.

Latin

Musculus piriformis

French

Muscle piriforme

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