Name
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.