Peroneus brevis

The peroneus brevis (Latin: musculus peroneus brevis; musculus fibularis brevis), also known as the fibularis brevis, is a small and relatively short muscle located in the lateral compartment of the lower leg inferior to the peroneus longus. It extends between the fibula and fifth metatarsal bone. The distal aspect of the muscle forms a tendon that runs just posterior to the lateral malleolus and crosses the ankle.

Origin

The peroneus longus originates from the distal two-thirds of the lateral surface of the fibula.

Insertion

The peroneus brevis inserts on the tuberosity of the fifth metatarsal bone.

Action

The peroneus brevis provides plantarflexion of the foot at the talocrural (ankle) joint and foot eversion at the subtalar joint. Also, it supports the lateral longitudinal arch of the foot.

Innervation

The peroneus brevis is innervated by the superficial peroneal (fibular) nerve (L5 - S2) - a branch of the common peroneal (fibular) nerve.

Blood supply

The peroneus brevis muscle receives arterial blood supply from the peroneal (fibular) artery - a branch of the posterior tibial artery.