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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 injuries cause aching burning pain in the wrist, thumb or fingers, often accompanied by numbness and tingling that may extend as far as the elbow. It may be difficult to grasp with the thumb.