 The longus and brevis are both located in the lateral compartment of the leg, supplied by the fibular artery and innervated by the superficial fibular nerve, while the tertius is located in the anterior compartment, supplied by the anterior tibial artery and innervated by the deep fibular nerve.Another difference between the longus, brevis and tertius is that while they all evert the foot; the peroneus longus and brevis plantarflex the foot, while the peroneus tertius dorsiflexes it.The peroneus muscles are highly variable and several variants have been noted as being occasionally present, such as "peroneus digiti minimi" and "peroneus quartus".