This is a small, thin, flat muscle situated beneath the pelvis. It covers the obturator foramen, and its fibres converge outwards, and end in a short flattened tendon.

Origin. - From the under surface of the pubis and ischium.

Insertion. - Into the trochanteric fossa behind and below the head of the femur.

Action. - It assists in extending the femur on the pelvis and rotating the hip outwards.