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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)
The carpal tunnel â a. narrow, rigid passageway of ligament and. bones at the base of the hand â houses the. median nerve and tendons. Sometimes, thickening from irritated tendons or other. swelling narrows the tunnel and causes. the median nerve to be compressed.