Carpal tunnel syndrome causes symptoms in one or both hands that, more rarely, may also extend up the arm. Symptoms are caused by compression of the median nerve in the carpal tunnel. This nerve supplies feeling to the thumb, index, middle, and half the ring finger. It also innervates the muscles that move the thumb toward the little finger and move the index finger around in a circle.
Carpal tunnel syndrome. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T113671/Carpal-tunnel-syndrome. Updated September 7, 2017.
Last reviewed September 2017 by EBSCO Medical Review Board James P. Cornell, MD
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