The extensor hallucis brevis is the medial slip of the extensor digitorum brevis, acting on the hallux rather than the lesser toes. Its belly on the dorsolateral foot near the sinus tarsi is frequently mistaken for a ganglion cyst.
| Origin | Dorsolateral calcaneus — distal to the sinus tarsi (medial slip of extensor digitorum brevis) |
|---|---|
| Insertion | Dorsal base of the hallux proximal phalanx |
| Nerve Supply | Deep peroneal nerve (L5, S1) |
| Blood Supply | Lateral tarsal artery from dorsalis pedis |
| Actions | Extends the hallux MTP joint |
|---|
EHB wasting indicates deep peroneal nerve dysfunction. Its preservation alongside EHL in peroneal nerve palsy helps localise the lesion. The EHB belly at the sinus tarsi is accessed in sinus tarsi syndrome surgery.
Visible and palpable as a soft tissue prominence on the dorsolateral foot near the sinus tarsi during resisted hallux extension.
EHB muscle prominence over the sinus tarsi contributing to footwear irritation in sinus tarsi syndrome, requiring surgical excision if persistently symptomatic.
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