The extensor digitorum brevis muscle (sometimes EDB) is a muscle

Muscle

Muscle is a contractile tissue of animals and is derived from the mesodermal layer of embryonic germ cells. Muscle cells contain contractile filaments that move past each other and change the size of the cell. They are classified as skeletal, cardiac, or smooth muscles. Their function is to...

 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 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 S1,S2). 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

• Extensor digitorum longus muscle
  Extensor digitorum longus muscle
  The Extensor digitorum longus is a pennate muscle, situated at the lateral part of the front of the leg.-Origin and insertion:It arises from the lateral condyle of the tibia; from the upper three-fourths of the anterior surface of the body of the fibula; from the upper part of the interosseous...
  
  
• Extensor hallucis brevis
• Extensor digitorum muscle
  Extensor digitorum muscle
  The extensor digitorum muscle is a muscle of the posterior forearm present in humans and other animals...
  
  

External links

- "The Foot: Muscles"

• PTCentral