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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. Carpal tunnel syndrome is a common condition involving numbness, pain, tingling and instability in the wrist, hand and fingers. It occurs when pressure is put on a nerve in the wrist called the median nerve, which controls motor function in the wrist and hand.