Extensor Digitorum

Written by Oliver Jones

Last updated October 5, 2022 • 1 Revisions

The extensor digitorum is a muscle within the superficial compartment of the posterior forearm.

The tendons of the extensor digitorum pass through the 4th extensor compartment at the wrist.

  • Attachments: Originates from the lateral epicondyle of the humerus. The tendon divides into four in the distal forearm, and inserts into the extensor hood of each digit.
  • Actions: Extension of the digits at the interphalangeal and metacarpophalangeal joints.
  • Innervation: Radial nerve (deep branch).
  • Blood supply: Radial artery

Fig 1
The muscles in the superficial layer of the posterior forearm.

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