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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 is a condition that 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.