Fluctuat nec mergitur - Free definition results from over 1700 online dictionaries
The radial nerve innervates muscles located in the arm and forearm. In the arm, it directly innervates the three heads of the triceps brachii. This muscle performs extension at the elbow. In the forearm, the deep branch of the radial nerve innervates the muscles in the posterior compartment of the forearm.o enter the forearm, the radial nerve moves anteriorly over the lateral epicondyle of the humerus, through the cubital fossa. Within the forearm, the nerve terminates by dividing into two branches: 1  Deep branch â A motor branch.
The radial nerve supplies sensation to the area on the thumb side of the back of your hand. The radial nerve controls movements in the muscles on the back of your arm and forearm, which are mainly extensors. A branch of the radial nerve, the posterior interosseous nerve, controls extension movements in your wrist, fingers, and thumb. You use your extensor muscles to raise your hand up and straighten your fingers. The radial nerve also controls the main muscle/tendon that extends the thumb.