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The Extensor Digiti Minimi is in the Superficial Layer of the Posterior Compartment of the forearm.
ATTACHMENTS:
- 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.
ACTIONS:
- Extends the little finger at the metacarpophalangeal and proximal and distal interphalangeal joints.
- Extends the hand at the wrist joint.
NOTES:
- The extensor digiti minimi is often involved with lateral elbow tendinopathy (aka tennis elbow).
- 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).
