Tags: Anatomical Structure, Muscle.
The vastus medialis (/ˈvæstəs ˌmɛdiˈeɪlɨs/ or /ˈvæstəs ˌmɛdiˈælɨs/) (vastus internus or teardrop muscle) is muscle located medially in the thigh that extends the knee. The vastus medialis is part of the quadriceps muscle.