The radial nerve runs down the underside of the arm and controls movement of the triceps (the muscle located at the back of the upper arm).

Radial nerve injury is also common after breaking the arm. In this article, learn about other causes, as well as symptoms and treatments. ... This nerve controls the triceps muscle.

Radial tunnel syndrome is a condition caused by a pinched radial nerve in your arm. ... It controls the movement of the muscle in your upper arm, called the tricep.

It is therefore an important motor nerve supplying muscles including the triceps, brachioradialis, extensor carpi radialis, supinator, extensor carpi ulnaris and extensor digitorum. The radial nerve ...