Anatomy, Bony Pelvis and Lower Limb, Foot Peroneus Brevis Muscle

The peroneus brevis muscle is the shorter of the two muscles that make up the lateral compartment of the leg with peroneus longus being the longer muscle. Peroneus brevis’ function is to evert the foot and plantar flex the ankle. It receives innervation from the superficial peroneal nerve, and its arterial supply is by muscular branches of the peroneal artery. The origin of peroneus brevis is the lower two-thirds of the lateral fibula and inserts on the proximal fifth metatarsal. The peroneus brevis muscle is relevant to occupational medicine as it is not uncommonly injured in lateral ankle sprains and its tendon (along with the tendon of the peroneus longus muscle) is the most commonly dislocated tendon in the ankle.