The |vastus medialis| is the deepest of the quadriceps muscles. The quadriceps muscle group consists of four muscles: the |rectus femoris|, the |vastus lateralis|, the |vastus intermedius|, and the |vastus medialis|. These muscles form a large, fleshy mass that covers the front and sides of the |femur| (upper leg bone). They are the primary extensor of the knee. The |vastus medialis| is a bulging teardrop form located on the inner front corner of the lower thigh. It can be divided into two portions, the |vastus medialis| longus, which extends the knee, and the |vastus medialis| oblique.
