Science Fair Project Encyclopedia
The radial nerve and its branches supply the dorsal muscles, such as triceps brachii , the extrinsic extensors of the wrist and hands, and the cutaneous nerve supply to most of the back of the hand. (The ulnar nerve cutaneously innervates the back of the little finger.)
The radial nerve divides into a deep branch, (which becomes the posterior interosseous nerve ), and continues as the superficial branch which goes on to innervate the dorsum (back) of the hand.
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