Radial Nerve

The Radial nerve is the largest and the terminal branch of the posterior cord receiving fibers from C5-T1. It courses posterior to the axillary artery and enters the radial groove with the profunda brachii artery taking a vertical course around the humeral shaft. The radial nerve innervates all of the muscles of the posterior compartment of the arm and forearm.

Wrist drop is the most common effect of peripheral neuropathy of the radial nerve.