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Pear-shaped muscle
Last reviewed: 23.04.2024
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Pear-shaped muscle (m piriformis) begins on the pelvic surface of the sacrum (II-IV sacral vertebra), lateral to the pelvic sacral orifices, exits from the pelvic cavity through the large sciatic foramen. Behind the neck of the hip, the muscle passes into a round tendon that attaches to the top of a large trochanter. Under this muscle there is a synovial pear-shaped muscle bag (bursa synovialis musculi piriformis).
Function of the pear-shaped muscle: turns the hip outward with a slight lead.
Innervation of the pear-shaped muscle: Muscular branches of the sacral plexus (SI-SIII).
Blood supply of pear-shaped muscle: lower gluteal, obturator, internal sexual artery.
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