Quadratus Femoris

The Quadratus Femoris is a muscle of the gluteal region.

Anatomical Attachments:

• Origin: Attaches to the external border of the ischial tuberosity.
• Insertion: Attaches to the greater trochanter of the femur and the linea quadrata.

Action: Laterally rotates the thigh.

Synergist:  

• Prime Movers: Gluteus maximus, Piriformis, Obturator externus and internus, Superior and Inferior gemellus.
• Accessory Movers: Gluteus medius, Sartorius, Iliopsoas, and Biceps (long head).

Antagonist: Gluteus minimus, Tensor fasciae latae.

Nerve Supply: L4, L5 and S1 nerves.

Vascular supply: Medial circumflex artery.

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