The structure of the quads
The quadriceps are a muscle group located at the front of the thigh, consisting of four main muscles: the vastus lateralis, vastus medialis, vastus intermedius, and rectus femoris.
The Vastus Muscles
The vastus lateralis is the most lateral muscle of the quadriceps. The vastus medialis is located medially compared to the vastus lateralis. The vastus intermedius is situated between the vastus lateralis and vastus medialis.
They originate from the greater trochanter of the femur and the linea aspera of the femur, then insert onto the tuberosity of the patella and the infrapatellar tubercle of the tibial tuberosity.
They are responsible for knee extension.
The Rectus Femoris
The rectus femoris, although part of the quadriceps, is anatomically distinct from the other three muscles. It originates from the iliac bone near the hip joint and inserts onto the tuberosity of the patella and the infrapatellar tubercle of the tibial tuberosity.
It is responsible for knee extension and hip flexion.
Video illustration
Main exercises
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