<Li> Flexing the wrist causes the flexor retinaculum to move closer to the radius which considerably decreases the cross section of the proximal opening of the tunnel . Additionally, the distal end of the capitate presses into the opening . </Li> <Li> In extreme extension, the lunate constricts the passage as it is pressed toward the interior of the tunnel . </Li> <P> Carpal tunnel syndrome is a syndrome characterised by tingling burning and pain (needle, pin) through the course of median nerve particularly over the outer fingers and radiating up the arm, that is caused by compression of the carpal tunnel contents . It is associated with repetitive use, rheumatoid arthritis, and a number of other states . It can be detected using Tinel's sign and the Phalen maneuver . It may be treated non-surgically by splinting and / or corticosteroid injection, though definitive management often requires surgical division of the flexor retinaculum, which forms the roof of the carpal tunnel . </P> <Ul> <Li> <P> Carpal tunnel </P> </Li> <Li> <P> Carpal tunnel </P> </Li> <Li> <P> Wrist joint . Deep dissection. Anterior, palmar, view . </P> </Li> <Li> <P> Wrist joint . Deep dissection. Anterior, palmar, view . </P> </Li> <Li> <P> Wrist joint . Deep dissection. Anterior, palmar, view . </P> </Li> <Li> <P> Carpal tunnel and thenar and hypothenar eminences </P> </Li> <Li> <P> Carpal tunnel </P> </Li> </Ul>

How many structures are in the carpal tunnel