median nerve

The median nerve is a major nerve in your arm that runs from your neck down to your hand. It travels through the upper arm and forearm, passing through the wrist into the palm. It supplies sensation to part of your palm and fingers, especially the thumb, index, middle, and part of the ring finger. It also controls some of the muscles that help you move your thumb and fingers. The median nerve is essential for both feeling and fine movements in your hand, and issues like compression or injury can cause numbness, tingling, or weakness.