The question "What is the main nerve in your arm?" is ambiguous because there are several major nerves in the arm. However, based on the provided reference, we can discuss the radial nerve as a significant nerve in the upper arm.
The brachial plexus, a network of nerves originating from the cervical spine, extends under the clavicle and through the armpit. In the upper arm, the radial nerve is particularly important. The reference states that the radial nerve wraps around the backside of the humerus bone. While not the only nerve, its size and function make it a major nerve of the arm.
Because the question is ambiguous, it is helpful to understand that multiple nerves play crucial roles in arm function.
