Extensor digitorum brevis muscle

Extensor digitorum brevis muscle
The mucous sheaths of the tendons around the ankle. Lateral aspect. (Extensor dig. brevis labeled at upper right.)
Details
Latin	Musculus extensor digitorum brevis
Origin	Dorsal surface of calcaneus
Insertion	Proximal dorsal region of middle phalanges 2, 3 and 4
Artery	Dorsalis pedis artery
Nerve	Deep fibular nerve
Actions	Extends digits 2 through 4
Antagonist	Flexor digitorum longus, Flexor digitorum brevis
Identifiers
Dorlands /Elsevier	m_22/12548900
TA
TH	{{#property:P1694}}
TE	{{#property:P1693}}
FMA	{{#property:P1402}}
Anatomical terms of muscle [[[d:|edit on Wikidata]]]

The extensor digitorum brevis muscle (sometimes EDB) is a muscle on the upper surface of the foot that helps extend digits 2 through 4.

Structure

Origin: forepart of upper and lateral surface of calcaneus, in front of groove for peroneus brevis, from interosseous talocalcaneal ligament, stem of inferior extensor retinaculum.

Course

Course: fibres passes obliquely forwards and medially crosses dorsum of foot and ends in four tendons. The medial part of muscle ends in tendon which crosses the dorsalis pedis artery and inserted into dorsal surface base of PPX of great toe, it is termed as extensor hallucis brevis. the other three tendons inserted into lateral sides of tendon of extensor digitorum longus which inserted into 2nd 3rd 4th toes.

Innervation

Nerve supply: lateral terminal branch of Deep Peroneal Nerve (deep fibular nerve) (proximal sciatic branches L4-L5, but most clinically relevant L5 with L4/L5 HNP causing L5 lesion). Same innervation of Extensor Hallucis Brevis

Action

Action: extends MTP of 1st to 4th digits and assists in extending the IP joints of 2nd, 3rd, and 4th digits.

Note: without EDL there is no extension of 5th digit.

Additional images

• Gray268.png

  Bones of the right foot. Dorsal surface.

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  Muscles of the front of the leg.

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  Cross-section through middle of leg.

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  Dorsum of Foot. Deep dissection.

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  Dorsum of Foot. Deep dissection.

See also

• Extensor digitorum longus muscle
• Extensor hallucis brevis
• Extensor digitorum muscle

External links

• -583729075 at GPnotebook
• Anatomy photo:16:st-0405 at the SUNY Downstate Medical Center - "The Foot: Muscles"
• Anatomy diagram: 39960.000-1 at Roche Lexicon - illustrated navigator, Elsevier
• PTCentral