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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 syndrome. The carpal tunnel is formed by carpal bones (floor), the transverse carpal ligament (roof), the scaphoid and trapezium (radial aspect), and the pisiform and hook of the hamate (ulnar aspect). The tunnel contains 4 FDS muscles, 4 FDP muscles, the FPL, and the median nerve.