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This medical illustration pictures the lower extremities of a male from the right side. The left leg is shown with skin whereas the right leg features the muscles of the knee: gastrocnemius, biceps fermoris, vastus intermedialis, vastus lateralis, iliotibial tract, tibialis anterior, extensor digitorum longus, and fibularis (peroneus) longus. The bones of the knee, ankle, and foot can be seen under the muscles.