Where is the TFL muscle and what does it do?

Answers: It arises from the anterior part of the outer lip of the iliac crest; from the outer surface of the anterior superior iliac spine, and factor of the outer border of the notch below it, between the gluteus medius and sartorius; and from the open surface of the fascia lata.

It is inserted between the two layers of the iliotibial company of the fascia lata about the crossroads of the middle and upper thirds of the thigh.

Function

The Tensor fasciae latae is a tensor of the fascia lata; continuing its action, the indirect direction of its fibers enables it to snatch the thigh and to rotate it inward.
In the erect posture, acting from below, it will serve to steady the pelvis upon the head of the femur; and by manner of the iliotibial band it steadies the condyles of the femur on the articular surfaces of the tibia, and assists the Glutaeus maximus within supporting the knee surrounded by the extended position.

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