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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 Surgery Overview. Carpal tunnel syndrome causes tingling, numbness, or pain in the hand. The wrist bones and ligament form a tunnel, a passage for the median nerve and finger tendons. Repetitive strain may cause swelling that pinches and traps the nerve within the tunnel.