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Obturator Internus


- See: External Hip Rotators;

- Anatomy:
    - origin: inferior medial surface of the obturator foramen and the quadrilateral surface;
    - insertion: after passing thru the lesser sciatic notch, it inserts on the superior posterior aspect of the greater trochanter of the femur; 
    - action: outward rotation of the thigh at the hip can also produce horizontal extension;
    - synergists: piriformis, obturator externus, quadratus femoris, gemellus superior and gemellus inferior