![]() If the tunnel is too small, it can squeeze the nerve and cause pain. There are several spots along the radial tunnel that can pinch the nerve. Pain is caused by pressure on the radial nerve. ![]() What causes the pain of radial tunnel syndrome? Related Document: A Patient’s Guide to Elbow Anatomy Causes This is the motion of using a screwdriver to tighten a screw.Īfter the radial nerve passes under the supinator muscle, it branches out and attaches to the muscles on the back of the forearm. The supinator muscle lets you twist your right hand clockwise. ![]() Passing through the radial tunnel, the radial nerve runs below the supinator muscle. On the lateral part of the elbow, the radial nerve enters a tunnel formed by muscles and bone. It then spirals outward and crosses the outside (the lateral part) of the elbow before it winds its way down the forearm and hand. The nerve passes down the back of the upper arm. The nerve roots join together to form three main nerves that travel down the arm to the hand. These openings are called neural foramina. ![]() The nerve roots exit through small openings between the vertebrae. The radial nerve starts at the side of the neck, where the individual nerve roots leave the spine.
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