Extensor carpi radialis longus muscle
The extensor carpi radialis longus muscle is innervated by the radial nerve, C6 and C7.
- extensor, because the muscle extends the wrist when contracted.
- carpi, meaning wrist, referring to the insertion point.
- radialis, meaning bone, because it is on the side of the arm with the radius, distinguishing it from the extensor carpi ulnaris muscle.
- longus, meaning long, differentiates it from the extensor carpi radialis brevis muscle, which is shorter and performs a similar action.