| Extensor digitorum brevis muscle | |
|---|---|
| The mucous sheaths of the tendons around the ankle. Lateral aspect. (Extensor dig. brevis labeled at upper right.) | |
| Latin | musculus extensor digitorum brevis |
| Gray's | subject #131 490 |
| Origin | dorsal surface of calcaneus |
| Insertion | proximal dorsal region of middle phalanges 2, 3 & 4 |
| Artery | dorsalis pedis artery |
| Nerve | deep fibular nerve |
| Actions | extends digits 2 through 4 |
| Antagonist | Flexor 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 |
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: 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.
Nerve supply: lateral terminal branch of Deep Peroneal Nerve (deep fibular nerve) (proximal sciatic branches S1,S2). Same innervation of Extensor Hallucis Brevis
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.
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