Extensor digitorum

Greg Mirt et al.

Extensor digitorum (ED), also known as extensor digitorum communis (EDC), is a muscle of the superficial layer of the posterior compartment of the forearm and with other extensor muscles arises from a common tendon attached to the lateral epicondyle of the humerus. ED represents a medial group of superficial extensor muscles. ED passes under an extensor retinaculum which holds it tight and passes through the 4th extensor compartment of the wrist.

Summary

  • origin: lateral epicondyle of humerus
  • insertion: middle, distal phalanges on posterior surface; extensor expansions of digits 2-5
  • innervation: radial nerve (C6-C8)
  • action: extension in metacarpophalangeal joint

Upper limb anatomy
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Article Information

rID: 41591
Section: Anatomy
Tag: refs
Synonyms or Alternate Spellings:
  • extensor digitorum communis
  • extensor digitorum muscle
  • extensor digitorum communis muscle

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Cases and Figures

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    Figure 1: extensor compartments of the wrist
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