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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)
T o understand where the carpal tunnel is, look at your wrist with the palm of your hand facing up; as you flex your wrist toward yourself, the area beneath the wrinkles is the carpal tunnel. Through this tunnel are blood vessels, nerves and tendons.