Extensor carpi ulnaris is located on the back (dorsum) of the forearm amongst the other wrist extensors. This is the only muscle responsible for ulnar deviation (moving the hand sideways in the direction of the little finger).
Origin - Lateral epicondyle of the humerus
Insertion - Base of the 5th metacarpal (dorsal side).
Actions - Extension of the wrist
Ulnar deviation (adduction) of the wrist.
Innervation - Radial nerve.
Daily uses - Accelerating a motorbike.
Example Strengthening Exercises - Wrist extension with a dumbbell
Examples Stretches - Wrist extensor stretch.