Origin External surface of obturator membrane and anterior bony margins of obturator foramen
Insertion Trochanteric fossa on the medial surface of the greater trochanter
Action Rotates the thigh laterally; also helps adduct thigh
Innervation Posterior division of obturator nerve innervates most of the obturator externus;  (L3, L4)
Arterial Supply Obturator and medial circumflex femoral arteries




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