Tensor Fasciae Latae Anatomy

Tensor Fasciae Latae Muscle

Origin: Anterior surface of the iliac crest and the anterior superior iliac spine
Insertion: The medial 1/3 to 1/2 of the thigh along the iliotibial tract
Actions: Assists with internal rotation of the thigh at the hip, abduction of the thigh at the hip, and extension of the leg at the knee through the iliotibial band
Innervation: Superior gluteal nerve (L4, L5, S1)
Blood Supply: Superior gluteal artery from the internal iliac artery

Primary Actions of the Tensor Fasciae Latae

The tensor fasciae latae is a small muscle and is not responsible for isolated movement.

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Secondary Actions of the Tensor Fasciae Latae:

1. Assists with internal rotation of the thigh at the hip
Agonists:

  • Gluteus Minimus (anterior fibers)
  • Gluteus Medius (anterior fibers)

Antagonists:

  • Obturator internus
  • Obturator externus
  • Gemellus superior
  • Gemellus inferior
  • Quadratus femoris

Tensor fasciae latae assists with internal rotation of the thigh at the hip by contracting its anterior fibers only. Adductor longus, adductor brevis, and adductor magnus (anterior part) assist with internal rotation of the thigh at the hip.

2. Assists with abduction of the thigh at the hip

  Agonists:

  • Gluteus Maximus (upper fibers)
  • Gluteus Medius
  • Gluteus Minimus

  Antagonists:

  • Adductor Longus
  • Adductor Brevis
  • Adductor Magnus

Sartorius also assists with abduction of the thigh at the hip.

3. Assists with extension of the leg at the knee through the iliotibial band

Agonists:

  • Vastus lateralis
  • Vastus medialis
  • Vastus intermedius
  • Rectus femoris

  Antagonists:

  • Biceps femoris
  • Semitendinosus
  • Semimembranosus