The peroneus brevis (also known as fibularis brevis, fibularis brevis muscle, peroneus brevis muscle, latin: musculus peroneus brevis) is a short muscle located in the lateral region of the lower leg just below the peroneus longus.
The peroneus longus originates from the lateral surface of the body of the fibula and the intermuscular septa.
Fibers of the peroneus brevis pass vertically downward behind the lateral malleolus and insert onto the fifth metatarsal bone.
The main functions of the peroneus brevis are flexion, abduction and pronation of the foot.
The peroneus brevis is innervated by the superficial peroneal nerve, a branch of the common peroneal nerve.