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 extensor carpi radialis muscles are situated on the lateral aspect of the posterior forearm. Due to their position, they are able to produce abduction as well as extension at the wrist. 1  Attachments: The ECRL originates from the supracondylar ridge, while the ECRB originates from the lateral epicondyle. 2  Actions: Extends and abducts the wrist. 3  Innervation: Radial nerve.