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A total of nine flexor tendons (not the muscles themselves) pass through the carpal tunnel: 1  flexor digitorum profundus (four tendons) 2  flexor digitorum superficialis (four tendons)  flexor pollicis longus (one tendon)
Carpal Tunnel Syndrome (CTS) Carpal tunnel syndrome (Latin carpus = wrist) is a painful condition of the wrist, hand and fingers, caused by repetitive use of the wrist, or swelling of the tissues in the wrist, resulting in a pressure upon the median nerve.