Sartorius

The sartorius (also sartorius muscle, latin: musculus sartorius) is the longest muscle of the thigh. The sartorius is a superficial and thin muscle located in the anterior region of the thigh.

Origin

The sartorius originates from the anterior superior iliac spine.

Insertion

The sartorius passes inferomedially across the anterior part of the thigh. Tendons of the sartorius, gracilis and semitendinosus muscles form a common plate called the pes anserinus that inserts onto the tibial tuberosity.

Action

The main function of the sartorius is flexion and external rotation of the femur, flexion and internal rotation of the knee.

Innervation

The sartorius is innervated by the femoral nerve.