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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)
During a carpal tunnel release, a surgeon cuts through the ligament that is pressing down on the carpal tunnel. This provides more room for the median nerve and tendons passing through the tunnel, and usually improves pain and function.