The nerves that innervate the wrist and hand exit the spinal cord as spinal roots C5 - T2. These spinal roots traverse the brachial plexus and emerge as the peripheral nerves. When discussing the nerve distribution of the wrist and hand, one can either discuss dermatomes or periipheral nerve distribution.

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Lorie Richards and Janice Loudon, University of Kansas Medical Center, School of Allied Health,
Occupational and Physical Therapy Education, October 1997