The brachial plexus is a group of spinal nerves that run from the lower neck through the upper shoulder area. These nerves allow the arm, forearm, and hand to move and feel things.

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Damage to the brachial plexus nerves can cause muscle and sensation problems. Symptoms may include loss of feeling or sensation in your arm or hand, trouble moving your arm, or a lack of muscle control in the arm, hand, or wrist.