radial nerve

Medical Dictionary

radial nerve n.
A nerve that arises from the posterior cord of the brachial plexus and divides into two terminal branches, designated superficial and deep, that supply muscular and cutaneous branches to the dorsal aspect of the arm and forearm.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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WordNet
radial nerve

noun
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 
WordNet® 3.0, © 2006 by Princeton University.
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