Extensor hallucis brevis muscle

The extensor hallucis brevis is a muscle on the top of the foot that helps to extend the big toe.

Structure

The extensor hallucis brevis is essentially the medial part of the extensor digitorum brevis muscle. Some anatomists have debated whether these two muscles are distinct entities.

The extensor hallucis brevis arises from the calcaneus and inserts on the proximal phalanx of the digit 1 (the big toe).

Innervation

Nerve supply: lateral terminal branch of Deep Peroneal Nerve (deep fibular nerve) (proximal sciatic branches S1,S2). Same innervation of Extensor Digitorum Brevis

Function

The extensor hallucis brevis helps to extend the big toe.

See also

This article uses anatomical terminology; for an overview, see Anatomical terminology.

• Extensor digitorum brevis
• Extensor hallucis longus

Additional Images

• 

  Dorsum of Foot. Deep dissection.

• 

  Dorsum of Foot. Deep dissection.

External links

• -577109939 at GPnotebook
• Anatomy figure: 16:03-05 at Human Anatomy Online, SUNY Downstate Medical Center - "Dorsum of the foot showing the tendons that cross the ankle joint."