Extensor Digitorum Brevis

Courtesy: Prof Nabil Ebraheim, University of Toledo, Ohio, USA

ANATOMY OF EXTENSOR DIGITORUM BREVIS

ORIGIN
From anterior part of the dorsal surface of the calcaneum

INSERTION

• Four tendons of extensor digitorum brevis insert into the proximal phalanx of the big toe and long extensor tendon to the toes 2,3 and 4
• The medial part of muscle known as the extensor hallucis brevis ends in a tendon and get inserted into the dorsal surface of the base of the proximal phalanx of big toe
• The other three tendons get inserted into the lateral side of tendons of the extensor digitorum longus of toes 2,3 and 4

ACTION

Helps to extend the first four digits

NERVE SUPPLY

Deep peroneal nerve

CLINICAL RELEVANCE

Irreducible dislocation of the medial subtalar joint can result from interposition of extensor digitorum brevis