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
