The vastus medialis, a quadriceps muscle, is situated medially on the thigh, contributing to knee stability and control.

Origin:
Arising from the intertrochanteric line and the medial lip of the linea aspera of the femur, the vastus medialis originates from the inner and posterior aspects of the femur.

Insertion:
The muscle inserts into the quadriceps tendon, which merges with the patellar ligament, attaching to the patella and tibia.

Function:
The primary function of the vastus medialis is knee extension, collaborating with other quadriceps muscles to straighten the leg. It plays a crucial role in activities like walking, running, and jumping, providing essential support and control to the knee joint. The vastus medialis also contributes to knee stability and alignment, playing a preventive role in patellar tracking issues and other knee-related conditions.

Knee Extension (Leg Extension)

Squat

Machine Squat

Lunge

Side Lunge

Leg Press