obturator externus
obturator externus muscle

The obturator externus muscle is sometimes considered part of this group, and sometimes excluded.

Moving from the inferior-most to the superior-most, they are: the tendon of the obturator externus muscle, the obturator internus, the superior gemellus and inferior gemellus.

The obturator externus groove is the groove on the posterior neck of the femur for the insertion of the obturator externus muscle, a muscle that is important during bipedal locomotion.