WebLecture-Pelvis-Lec23

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I. Orientation of Pelvis

II. Osteology

III. Joints

IV. Ligaments

V. Pelvic Musculature

VI. Perineum

WebLecture Slide 23

The obturator externus muscle takes its origin from the external or anterior surface of the obturator membrane and from the portions of the ischium and pubis that surround the anterior aspect of the obturator foramen. Like the obturator internus, the obturator externus converges to a slim tendon and follows a posterosuperior trajectory, passing behind the neck of the femur to insert on the trochanteric fossa of the femur. Three dimensional models are needed to appreciate the angle used by this muscle to pass from the anterior surface of the obturator membrane to the posterior aspect of the femur. The obturator externus muscle is primarily a lateral rotator of the thigh and is supplied by the obturator nerve as it leaves the pelvis.

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