Radial nerve

A branch of the brachial plexus. The radial nerve, one of the main nerves of the arm, runs from the shoulder to the hand. It controls muscles which straighten the wrist, and conveys sensation from the back of the forearm; the thumb, 2nd, and 3rd fingers; and the base of the thumb. The nerve may be damaged by a fracture of the humerus or by persistent pressure on the armpit.


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