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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)
Dr. Reid Abrams discusses carpel tunnel syndrome. Carpal tunnel syndrome (CTS) is a condition in which the median nerve is compressed as it passes through an opening from the wrist to the hand called the carpal tunnel. The carpal tunnel is about 1Â½ inches long and is located at the base of the hand near the wrist.