radial nerve

Wiktionary

1. n. anatomy A large nerve, carrying both sensory and motor neurones, that supplies the dorsal aspect of the forearm and arm

WordNet 3.0

1. n. largest branch of the brachial plexus; extends down the humerus to the lateral epicondyle where it divides into one branch that goes to the skin on the back of the hand and another that goes to the underlying extensor muscles