NCBI Bookshelf. Alin Gragossian ; Matthew Varacallo. Authors Alin Gragossian 1 ; Matthew Varacallo 2.
The radial nerve runs down the underside of your arm and controls movement of the triceps muscle, which is located at the back of the upper arm. The radial nerve is responsible for extending the wrist and fingers. It also controls sensation in part of the hand.
The human hand is a fascinatingly intricate arrangement of pulleys, tendons, muscles, and nerves that work together in a complex system to perform daily tasks. It is often difficult to visualize the various paths that the tendons and muscles take. It can also make a thorough hand exam difficult to perform with proficiency.
Radial nerve pain can be described as the type that occurs when your palm is pressed against something and your wrist bent back. The sharp, radiating, or burning pain is typically felt in the back of the hand, around the thumb, and in the middle and index fingers. Oftentimes, the pain is accompanied by the inability to fully straighten your arm or fingers.
The radial nerve is a nerve in the human body that supplies the posterior portion of the upper limb. It innervates the medial and lateral heads of the triceps brachii muscle of the arm, as well as all 12 muscles in the posterior osteofascial compartment of the forearm and the associated joints and overlying skin. The radial nerve and its branches provide motor innervation to the dorsal arm muscles the triceps brachii and the anconeus and the extrinsic extensors of the wrists and hands; it also provides cutaneous sensory innervation to most of the back of the hand, except for the back of the little finger and adjacent half of the ring finger which are innervated by the ulnar nerve.
In this article, we shall look at the anatomy of the radial nerve — its anatomical course and its motor and sensory functions. We shall also consider the clinical consequences of damage to the nerve. The radial nerve is the terminal continuation of the posterior cord of the brachial plexus.
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Radial nerve dysfunction is a problem with the radial nerve. This is the nerve that travels from the armpit down the back of the arm to the hand. It helps you move your arm, wrist, and hand.