The brachial plexus is a group of nerves that start in the spinal cord in the neck and travel down the arm. These nerves control the muscles of the shoulder, elbow, wrist and hand, as well as provide feeling in the arm. If you have a brachial plexus injury, it means you have damaged a nerve.
Nerve injuries can be very serious, as they can stop signals to and from the brain. Nerves can be damaged by stretching, pressure or cutting. Stretching can occur when the head and neck are forced away from the shoulder, such as during a motorcycle or car accident. Pressure could occur if the brachial plexus is crushed, which can happen during a fracture or dislocation. You will know if you have a nerve injury, as opposed to just a broken bone or other injury, if you’ve lost feeling in your arm.