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Muscles of the Lower Extremity / Piriformis
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| Origin |
Anterior surface of lateral process of sacrum and gluteal surface of ilium at the margin of the greater sciatic notch |
| Insertion |
Superior border of greater trochanter |
| Action |
Lateral rotator of the hip joint; also helps abduct the hip if it is flexed |
| Innervation |
Piriformis nerve (L5, S1, S2) |
Arterial
Supply |
Superior and inferior gluteal and internal pudendal arteries |
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