Extensor hallucis brevis muscle

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

Extensor hallucis brevis
Muscles of the front of the leg. (Ext. hallucis brevis colored in red.)
Animation
Details
Origin	calcaneus
Insertion	proximal phalanx of digit 1 (hallux, or the great toe)
Artery	dorsalis pedis artery
Nerve	deep fibular nerve
Actions	Extend hallux
Antagonist	Flexor hallucis brevis muscle
Identifiers
Latin	musculus extensor hallucis brevis
TA98	A04.7.02.054
TA2	2670
FMA	51141
Anatomical terms of muscle

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).

Nerve supply

Nerve supplied by 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

• Extensor digitorum brevis
• Extensor hallucis longus

Additional Images

• 
  Ext. hallucis brevis labeled at center.
• 
  Dorsum of Foot. Deep dissection.
• 
  Dorsum of Foot. Deep dissection.

External links

• 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."