Piriformis

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The Lateral Hip Rotators
Piriformis
Muscle Type
Origin	2, 3, 4 costotransverse bars of anterior sacrum, few fibers from superior border of greater sciatic notch
Insertion	Anterior part of medial aspect of greater trochanter of femur
Action	Externally rotates and stabilises the hip
Synergists	External Obturator, Gemelli Muscles, Internal Obturator, Quadratus Femoris
Antagonists
Spinal innervation	S1, S2
Peripheral Innervation	Nerve to Piriformis
Vasculature	Inferior gluteal, lateral sacral and superior gluteal artery.
Feature	Piriformis Syndrome

See Also

• Piriformis Syndrome