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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

hiprotators:


 
 
 
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