M. tibialis anticus longus
Originates on the ventro-lateral surface of the medial condyle of the femur. Its tendon extends in a groove over the knee in the lateral surface of the tibiofibular head, and penetrates the M. peroneus tendon. Insertion is by a lateral and medial head on the dorso-lateral surface of the fibulare and the medial border of the proximal end of the tibiale respectively.