Extensor digitorum brevis muscle

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Extensor digitorum brevis muscle
Gray441.png
The mucous sheaths of the tendons around the ankle. Lateral aspect. (Extensor dig. brevis labeled at upper right.)
Latinmusculus extensor digitorum brevis
Gray'ssubject #131 490
Origindorsal surface of calcaneus
Insertion   proximal dorsal region of middle phalanges 2, 3 & 4
Arterydorsalis pedis artery
Nervedeep fibular nerve
Actionsextends digits 2 through 4
AntagonistFlexor digitorum longus, Flexor digitorum brevis
 
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Extensor digitorum brevis muscle
Gray441.png
The mucous sheaths of the tendons around the ankle. Lateral aspect. (Extensor dig. brevis labeled at upper right.)
Latinmusculus extensor digitorum brevis
Gray'ssubject #131 490
Origindorsal surface of calcaneus
Insertion   proximal dorsal region of middle phalanges 2, 3 & 4
Arterydorsalis pedis artery
Nervedeep fibular nerve
Actionsextends digits 2 through 4
AntagonistFlexor digitorum longus, Flexor digitorum brevis

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

Contents

Structure

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

Course

Course: fibres passes obliquely forwards and medially crosses dosum 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.

See also

Additional images

External links