Obturator Externus

Origin External surface of obturator membrane and anterior bony margins of obturator foramen
Insertion Posteromedial surface of greater trochanter of femur
Action Rotates the thigh laterally; also helps adduct thigh
Innervation Posterior division of obturator nerve innervates most of the adductor magnus; vertical or hamstring portion innervated by tibial nerve (L3, L4)
Arterial Supply Obturator and medial circumflex femoral arteries

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Muscle Atlas of the Extremities