[TA] medial head of quadriceps muscle of anterior (extensor) compartment of thigh; origin, medial lip of linea aspera; insertion, tibial tuberosity by way of common tendon of quadriceps femoris and ligamentum patellae; action, extends leg; nerve supply, femoral. SYN: musculus vastus medialis [TA], medial great muscle, medial vastus (muscle), musculus vastus internus.
