Obturator externus muscle

The obturator externus muscle is a muscle in the hip that rotates the hip laterally (turns the knee cap outward).

Origin
The obturator externus originates from the pelvis, on the rim of the obturator foramen at the junction of the pubic bone and the ischium, and the outer obturator membrane.

Insertion
The obturator externus inserts on the femur at the trochanteric fossa on the medial surface of the greater trochanter.

Innervation
The obturator externus is innervation by the posterior division of the obturator nerve (L2-L4).