The vastus medialis is located on the medial (inner) side of the thigh, somewhat lower than the lateralis, and is partially covered by the rectus femoris.

Origin

The vastus medialis originates on the medial side of almost the entire shaft of the femur.

Insertion

The vastus muscles run almost the entire length of the femur and converge into the quadriceps femoris tendon, which attaches to the patella bone (kneecap).

Function

Knee joint extension.

Knee Extension (Leg Extension)

Squat

Machine Squat

Lunge

Side Lunge

Leg Press