Gluteus medius muscle
Origin and insertion
It arises from the outer surface of the ilium between the iliac crest and posterior gluteal line above, and the anterior gluteal line below; it also arises from the gluteal aponeurosis covering its outer surface.
A bursa separates the tendon of the muscle from the surface of the trochanter over which it glides.
The Glutæi medius and minimus abduct the thigh, when the limb is extended, and are principally called into action in supporting the body on one limb, in conjunction with the Tensor fasciæ latæ.
Their anterior fibers, by drawing the greater trochanter forward, rotate the thigh inward, in which action they are also assisted by the Tensor fasciæ latæ. When the hip is flexed to ninety degrees however the glutæi medius aids in rotating the thigh outwards.
The posterior border may be more or less closely united to the piriformis, or some of the fibers end on its tendon.
The posterior fibres of gluteus medius contract to produce hip extension, lateral rotation and abduction. During gait, the posterior fibres help to decelerate internal rotation of the femur at the end of swing phase.