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- Posterior ulna to the index finger (finger #2).
- Extends the index finger at the metacarpophalangeal and proximal and distal interphalangeal joints.
- Extends and radially deviates the hand at the wrist joint.
- Supinates the forearm at the radioulnar joints.
- Other than the thumb, only the index and little fingers (fingers #2 and 5) have a second extrinsic extensor muscle. Having two extensor muscles allows the index finger to be so functional at physically pointing at and indicating things in the visual field.
- Both the extensor indicis and the extensor digiti minimi attach into the ulnar side of the distal tendon of extensor digitorum going to the respective finger.