The brachial plexus is a network of nerves that originate near the neck and shoulder. These nerves begin at the spinal cord in the neck and control the hand, wrist, elbow, and shoulder.

Medically reviewed by Theresa Marko, PT, DPT, MS Ulnar nerve entrapment occurs when there is too much pressure on the ulnar nerve. This leads to hand numbness or tingling in the forearm and pinky side ...