Where does the sartorius muscle insert?

The sartorius muscle inserts on the medial surface of the tibia, specifically at a location known as the pes anserinus. This is an important anatomical site where tendons from three muscles—the sartorius, gracilis, and semitendinosus—attach to the medial side of the tibia. The function of the sartorius includes flexion, abduction, and lateral rotation of the hip, as well as flexion of the knee, making its insertion point significant for facilitating movement in the lower limb.

The other choices highlight alternative structures where muscles might insert, but they do not accurately represent the sartorius. For instance, the quadriceps tendon onto the tibial tuberosity is where the quadriceps femoris muscles converge, while the head of the fibula serves as an attachment for other muscles like the biceps femoris. The posterior femur is involved with other muscles as well but does not pertain to the sartorius insertion. Understanding the correct insertion point helps in both identifying muscle functions and in practical applications such as sports massage, where targeted techniques can be employed based on muscle anatomy.