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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 is caused by a pinching of the median nerve. This nerve passes through a tunnel in the wrist called the carpal tunnel; several other tendons that control the flexion of your fingers are also located in this tunnel (flexor tendons). The roof of this tunnel (closest to the skin of the palm) is called the transverse carpal ligament.