Extensor Digiti Minimi

Joe Muscolino

Share This

The extensor digiti minimi is seen. The extensor digitorum has been ghosted in.

The Extensor Digiti Minimi is in the Superficial Layer of the Posterior Compartment of the forearm.



  • Lateral epicondyle of the humerus via the common extensor belly/tendon to the little finger (finger #5).
    • The distal attachment is into the ulnar side of the distal tendon of the extensor digitorum that goes to the little finger.



  • Extends the little finger at the metacarpophalangeal and proximal and distal interphalangeal joints.
  • Extends the hand at the wrist joint.



  1. The extensor digiti minimi is often involved with lateral elbow tendinopathy (aka tennis elbow).
  2. Of fingers #2-5 (index, middle, ring, and little), only the index and little fingers have a second long extrinsic extensor muscle (the index finger has the extensor indicis).