vastus lateralis

noun
vastus lat·er·a·lis | \ -ˌlat-ər-ˈā-ləs , -ˈal-əs \

Medical Definition of vastus lateralis 

: 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

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