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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)
Once the carpal tunnel begins to collapse in on itself, any form of repetitive or static flexion such as typing, writing, grasping, etc., will cause friction of the flexor tendons against the carpal bones, median nerve and blood vessels, causing irritation, inflammation and increased swelling of the structures within the carpal tunnel.