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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, which is located in the wrist joint, is a narrow passageway in which the nine flexor tendons and median nerve pass through in order to supply function, feeling and movement to the thumb, index, middle and one-half of the ring finger.