Pronunciation (OB-tu-ra-tur ex-TER-nus) Origin/Proximal Attachment Medial surface of obturator foramen; external surface of obturator membrane Insertion/Distal Attachment Trochanteric fossa of femur Action/Relevance Externally rotate the thighAssists to flex hip Innervation Nerve to obturator externus (L3, 4) Notes Flat triangular muscle covering the external surface of the anterior aspect of the pelvis Crosses the back of the femoral neck | 
