Muscle
Obturator externus
Lateral rotator (medial thigh group)
High-yield
Obturator nerve (not a gluteal nerve); laterally rotates the thigh.
Overview
A deep muscle on the external obturator membrane that laterally rotates the hip; the only obturator-nerve-supplied lateral rotator.
Reference facts
- Origin
External surface of the obturator membrane and margins of the obturator foramen
- Insertion
Trochanteric fossa of the femur
- Action
Laterally rotates the thigh; steadies the femoral head in the acetabulum
- Innervation
Obturator nerve (L3, L4)
- Blood supply
Obturator artery