Hip External Rotators

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Other Names Six Deep Lateral Rotator Hip Muscles Heads Piriformis Gemellus Superior Obturator Internus Gemellus Inferior Obturator Externus Quadratus Femoris Movement Hip External Rotation [1, 2, 3, 4, 5, 6 ] Transverse Abduction [1, 5 ] Internal Rotation [1] (see comments) Attachments Origin Sacrum Anterior [1 ] Sacrotuberous Ligament [1 ] Ischium Posterior Portions Ischial Spine [2 ] Ischial Tuberosity Posterior Portion [4 ] External Border [6 ] Obturator Foramen [5, 6 ] Ischium and Pubis Inside Surfaces and Obturator Membrane [3 ] Insertion Femur Greater Trochanter Medial Surface [2, 3, 4 ] Superior/Medial Surface [1 ] Posterior Surface Quadrate Tubercle [6 ] Trochanteric Fassa [5 ] Comments Gemellus Superior [2 ] and Gemellus Inferior [4 ] also known collectively as Gemelli. Insertion of piriformis is high up on greater trochanter, so it assists in external rotation from anatomical position, but when it hip is flexed, piriformis assists in internal rotation of hip.