Tensor fascia lata muscle

The tensor fascia lata muscle  is located on the proximal lateral thigh and functions to stabilize the hip and knee joints by inserting onto the ilitotibial tract (IT band) and contracting concentrically to tighten the band. 

This muscle originates on the anterior superior iliac spine (ASIS) and is innervated by the superior gluteal nerve.

Action: Stabilizes the hip in extension

Innervation: superior gluteal n.

Origin: ASIS of the ileum

Insertion: Iliotibial tract/band