Obturator externus

Obturator foramen and obturatory membrane

Medial aspect of greater trochanter of femur

Adduct thigh, rotate laterally thigh

Posterior branch of obturator nerve (third and fourth lumbar nerves)

Obturator artery

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Relations:

The obturator vessels lie between the muscle and the obturator membrane; the anterior branch of the obturator nerve reaches the thigh by passing in front of the muscle, and the posterior branch by piercing it.