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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)
If the tendon size increases due to inflammation or hypertrophy (growth), or if the carpal tunnel size decreases in size due to laxity in the joint, the structures within the carpal tunnel become impinged and carpal tunnel syndrome results.