tensor fascia lata
Muscular sheath â forms a sheath for the tensor fascia lata muscle. Tensor Fascia Lata (TFL) The tensor fascia lata is a gluteal muscle that acts as a flexor, abductor and internal rotator of the hip. Its nomenclature however, is derived from its additional role in tensing the fascia lata. The muscle originates from the iliac crest, and descends down the superolateral thigh.