UpToDate allows you to search in the languages below. Please select your preference. Topics will continue to be in English.
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)
Muscle Imbalance and the Narrowing of the Carpal Tunnel. Although increased size / *hypertrophy of the tendons can occur, the most prevalent cause of carpal tunnel syndrome is the **narrowing of the carpal tunnel due to a musculoskeletal imbalance between over and underused muscles in the hand and forearm.