vastus lateralis

noun

vastus lat·​er·​a·​lis -ˌlat-ər-ˈā-ləs  -ˈal-əs 

: the division of the quadriceps muscle that covers the outer anterior aspect of the femur, arises chiefly from the femur, and inserts into the outer border of the patella by a flat tendon which blends with that of the other divisions of the muscle and sends an expansion to the capsule of the knee

called also vastus externus