What Is a Knee Extensor

Description. The extensor mechanism of the knee comprises the quadriceps muscle and tendon, the patella, and the patellar tendon (also known as the infra-patellar ligament). Disruption of any of these components impedes a person’s ability to actively extend the knee or resist passive flexion.

What 4 muscles extend the knee?

The quadriceps femoris muscle group (rectus femoris, vastus lateralis, vastus medius, and vastus intermedius) crosses the knee via the patella and acts to extend the leg. The hamstring group muscles (semitendinosus, semimembranosus, and biceps femoris) flex the knee and extend the hip.

What extends the great toe?

The extensor hallucis longus muscle is a thin skeletal muscle, situated between the tibialis anterior and the extensor digitorum longus. It extends the big toe and dorsiflects the foot.