What is the Vastus Medialis?
The vastus medialis is one of the four muscles that make up the quadriceps group on the front of your thigh. It sits on the inner side of the thigh, close to the knee, and you can often see it as the teardrop shaped muscle just above the inside of the kneecap when it is well developed. Like the rest of the quadriceps, its main job is to straighten the knee, which you do when you stand up, climb stairs, sprint, jump, or drive out of the bottom of a squat or lunge.