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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)
1 Carpal tunnel syndrome is caused by pressure on a nerve (median nerve) in the wrist. 2  The symptoms include tingling, numbness, weakness, or pain of the fingers and hand. 3  Tendon pain is actually a symptom of tendinosis, a series of very small tears (microtears) in the tissue in or around the tendon.