The |peroneus tertius| lies against the |peroneus brevis| muscle. It is connected to the |extensor digitorum| longus, and often considered a part of it. The |peroneus tertius| arises from the lower third of the |fibula| (lower leg bone) and the adjacent interosseous membrane and continues downward and slightly forward, across the ankle, where it tapers into a narrow, flat ~tendon~ that passes over the |extensor digitorum| brevis and inserts into the fifth metatarsal bone (little toe). This muscle lifts the foot.
