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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)
Several factors can attribute pinched nerve in wrist. 1  Overuse of wrist joint is the main reason. 2  Awkward and repetitive hand movements over a period of time can cause irritation and inflammation of the tendons and cartilage in the carpal tunnel.