Muscle Atlas

Obturator Internus

Origin: Internal surface of obturator membrane and posterior bony margins of obturator foramen
Insertion: Medial surface of greater trochanter of femur, in common with superior and inferior gemelli
Action: Rotates the thigh laterally; also helps abduct the thigh when it is flexed
Innervation: Nerve to the obturator internus and superior gemellus -- a branch of the sacral plexus (L5, S1)
Arterial Supply: Internal pudendal and superior and inferior gluteal arteries

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