Extensor carpi ulnaris
Arms
- Origin
- Lateral epicondyle of the humerus and the back border of the ulna
- Insertion
- Base of the fifth metacarpal
- Action
- Extends the wrist and bends it toward the little-finger side
- Nerve supply
- Posterior interosseous nerve (radial nerve, C7–C8)
The wrist extensor on the little-finger side. With the flexor carpi ulnaris it tilts the hand toward the little finger.