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Radial nerve



Definition

A sensorimotor nerve, the radial nerve is the nerve of the extension and supination of the upper limb, or the arm. The radial nerve fibers originate in the C6, C7, C8, and T1 nerve roots. It sprouts from the axilla behind the pectoralis minor. It then runs along the posterior of the arm, behind the bone of the humerus, where it divides into several branches to innervate the triceps and anconeus muscles, before ending in the external bicipital groove.

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