Muscle Anatomy

vastus medialis

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

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.

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

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.