Name

# Peroneus Brevis

Pronunciation

(per-o-NE-us BREV-is)

Origin/Proximal Attachment

Inferior two thirds of lateral surface of fibula, anterior to peroneus longus

From anterior & posterior crural intermuscular septa

Insertion/Distal Attachment

Dorsal surface of tuberosity on lateral surface of base of fifth metatarsal.

Action/Relevance

Everts foot

Weakly plantar-flexes foot

May limit inversion of the foot

May help to steady the leg on the foot

Innervation

Superficial peroneal nerve (L5, S1)

Notes

Fusiform

Passes vertically down & ends in a tendon which passes behind the lateral malleolus together with, but anterior to, that of the peroneus longus, the two tendons running deep to the superior peroneal retinaculum in a common synovial sheath.

It then runs forward on the lateral side of the calcaneus above the peroneal trochlea & the tendon of peroneus longus.

On the lateral surface of the calcaneus the tendons of longus & brevis occupy separate osseo-aponeurotic canals formed by the calcaneus & the inferior peroneal retinaculum; each tendon enveloped in a separate forward prolongation of the common synovial sheath.