Muscle Atlas

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
Arterial Supply: Obturator and medial circumflex femoral arteries

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