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The radial nerve is a nerve in the upper limb that is derived from the brachial plexus. It is a continuation of the posterior cord of this plexus and originates from the ventral rami of C5, C6, C7, C8 ad T1. It initially travels obliquely in the posterior compartment of the arm to supply the long and medial head of the triceps brachii muscle. It then pierces the lateral intermuscular septum to enter the anterior compartment of the arm and descends in between the brachioradialis and brachialis muscles. Anterior to the lateral epicondyle it branches into superficial and deep branches, which supply muscles in the posterior compartment of the forearm.
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