Extensor digitorum brevis muscle
 | This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. (May 2015) |
| Extensor digitorum brevis muscle | |
|---|---|
 The mucous sheaths of the tendons around the ankle. Lateral aspect. (Extensor dig. brevis labeled at upper right.) | |
 Animation | |
| Details | |
| 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 | |
| Latin | musculus extensor digitorum brevis |
| TA98 | A04.7.02.055 |
| TA2 | 2671 |
| FMA | 51140 |
| Anatomical terms of muscle | |
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
[edit]The muscle originates from the forepart of the upper and lateral surface of the calcaneus (in front of the groove for the peroneus brevis tendon), from the interosseous talocalcaneal ligament and the stem of the inferior extensor retinaculum. The fibres pass obliquely forwards and medially across the dorsum of the foot and end in four tendons. The medial part of the muscle, also known as extensor hallucis brevis, ends in a tendon which crosses the dorsalis pedis artery and inserts into the dorsal surface of the base of the proximal phalanx of the great toe. The other three tendons insert into the lateral sides of the tendons of extensor digitorum longus for the second, third and fourth toes.
Nerve supply
[edit]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 spinal disc herniation causing L5 lesion). Same innervation of Extensor Hallucis Brevis
Function
[edit]Extensor digitorum brevis extends the first four digits at the metatarsophalangeal joint and assists in extending the second, third and fourth digits at the interphalangeal joint. The fifth digit, lacking any insertion from extensor digitorum brevis, can only be raised by the long extensor.
Additional images
[edit] | This gallery of anatomic features needs cleanup to abide by the medical manual of style. |
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Bones of the right foot. Dorsal surface. -
Muscles of the front of the leg. -
Cross-section through middle of leg. -
Dorsum of foot. Deep dissection. -
Dorsum of foot. Deep dissection.
See also
[edit]External links
[edit]
- Anatomy photo:16:st-0405 at the SUNY Downstate Medical Center - "The Foot: Muscles"
- "Anatomy diagram: 39960.000-1". Roche Lexicon - illustrated navigator. Elsevier. Archived from the original on 2012-07-22.
- PTCentral
