what spinal nerve is tricep innervates
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.These muscles generally extend at the wrist and finger joints.he nerve arises in the axilla, exiting posteriorly to the brachial artery. Here it supplies branches to the long and medial heads of the triceps brachii. The radial nerve then descends down the arm, travelling in a shallow depression on the surface of the humerus. This depression is known as the radial groove.