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Quadratus femoris

The quadratus femoris (also quadratus femoris muscle, latin: musculus quadratus femoris) is a flat, quadrilateral muscle of the posterior group of the pelvic girdle.

Origin

The quadratus femoris originates from the ischial tuberosity.

Insertion

The quadratus femoris passes laterally and inserts onto the intertrochanteric crest of the femur.

Action

The main function of the quadratus femoris is the external rotation of the femur.

Innervation

The quadratus femoris is innervated by the sciatic nerve arising from the sacral plexus.