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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 Numbness, tingling, and pain in your thumb and first three fingers of your hand are common symptoms of carpal tunnel syndrome. 2  The pain in your carpal tunnel is due to excess pressure in your wrist and on the median nerve.  Carpal tunnel syndrome can be made worse if the wrist is overextended repeatedly.