The ulnar nerve is a major nerve that runs down through your arm and into your hand. It affects functions like squeezing and grasping things. Injuries to the ulnar nerve can be painful and limiting.

The median nerve is one of many peripheral nerves that extend throughout the body. This nerve in particular provides important control of the hand, wrist, and forearm and is commonly associated with ...

We’re celebrating 180 years of Scientific American. Explore our legacy of discovery and look ahead to the future. Billions of nerve cells send signals coursing through our bodies, serving as conduits ...