Gluteus Medius Anatomy

Gluteus Medius Muscle

Origin: Outer surface of the ilium, between the anterior and inferior gluteal lines, and the edge of the greater sciatic notch
Insertion: Posterolateral surface of the greater trochanter of the femur
Actions: Abduction and internal rotation of the thigh at the hip
Innervation: Superior gluteal nerve (L4, L5, S1)
Blood Supply: Superior gluteal artery from the internal iliac artery

Primary Actions of the Gluteus Medius Muscle

1. Abduction of the thigh at the hip

Agonists:

  • Gluteus maximus (upper fibers)
  • Gluteus minimus

Antagonists:

  • Gluteus maximus (upper fibers)
  • Gluteus medius
  • Gluteus minimus

2.  Internal rotation of the thigh at the hip

  Agonists:

  • Tensor fasciae latae
  • Gluteus minimus (anterior fibers)

  Antagonists:

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

Adductor longus, adductor brevis, and adductor magnus (anterior part) assist with internal rotation of the thigh at the hip.

Secondary Actions of the Gluteus Medius:

1. Assists with external rotation of the thigh at the hip (posterior fibers)
Agonists:

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

Antagonists:

  • Tensor fasciae latae
  • Gluteus minimus (anterior fibers)
  • Gluteus medius (anterior fibers)

Piriformis, gluteus maximus, and sartorius may also assist with external rotation of the thigh at the hip.

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