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Piriformis
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Muscle Type
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Origin
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2, 3, 4 costotransverse bars of anterior sacrum, few fibers from superior border of greater sciatic notch
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Insertion
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Anterior part of medial aspect of greater trochanter of femur
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Action
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Externally rotates and stabilises the hip
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Synergists
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Antagonists
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Spinal innervation
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Peripheral Innervation
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Vasculature
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Inferior gluteal, lateral sacral and superior gluteal artery.
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