Name

# Extensor Hallucis Brevis

Pronunciation

(eks-TEN-sor HA-loo-sus BREV-is)

Origin/Proximal Attachment

Upper anterolateral calcaneus; inferior extensor retinaculum

Insertion/Distal Attachment

Base of proximal phalanx of hallux

Action/Relevance

Extends big toe

Innervation

Deep Peroneal nerve (L4, 5)

Notes

Extensor hallucis brevis is a part of the extensor digitorum brevis muscle of the foot, but some sources consider it to be a separate muscle.

In continuity with extensor digitorum brevis, it arises from the lateral and superior surface of the calcaneus. It passes anteriorly and medially to insert into the dorsal base of the proximal phalanx of the great toe.

It acts to extend the fully flexed great toe.