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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)
Cause. Carpal tunnel syndrome is caused by a pinching of the median nerve. This nerve passes through a tunnel in the wrist called the carpal tunnel; several other tendons that control the flexion of your fingers are also located in this tunnel (flexor tendons).