Vastus medialis is found in the anterior compartment of the thigh and is the most medial component of the quadriceps femoris muscle. It arises from the femoral shaft and medial edge of the linea aspera. Distally it joins the other quardiceps muscles to form the quadriceps tendon.
As the other vasti muscles it extends the knee joint. In addition, it has oblique fibres at its distal end which arises from adductor magnus tendon and insert into the medial border of the patella. These fibres are sometimes known as vastus medialis obliquus and are important in counteracting the strong vastus laterlis and preventing lateral dislocation of the patella.
It is innervated by the femoral nerve (L2,3,4).
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