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Illustration from 'Surgical Anatomy: The Treatise of the Human Anatomy and Its Applications to the Practice of Medicine and Surgery, volume III' (by Dr. John Blair Deaver) shows how the extensor of digits is a muscle on the upper surface of the foot that help extends the foot, 1903. The peroneus brevis muscle (or fibularis brevis) lies under cover of the peroneus longus, and is a shorter and smaller muscle. It is also innervated by the superficial fibular (peroneal) nerve. The muscle acts in plantarflexion and eversion of the foot. The peroneus longus (also known as fibularis longus) is a superficial muscle in the lateral compartment of the leg, and acts to evert and plantar flex the ankle. It is situated at the upper part of the lateral side of the leg, and is the most superficial of the three peroneus muscles. . (Photo by VintageMedStock/Getty Images)