<prompt> Carpal tunnel syndrome involvesMedian nerveAnterior interosseous nerveUlnar nerveRadial nerve  <response>: CARPAL TUNNEL SYNDROME:-Injury to median nerve in carpal tunnel.Causes:-Tenosynovitis of flexor tendons.MyxedemaRetention of fluid in pregnancy Fracture dislocation of lunate bone.Osteoarthritis of wrist.Symptoms:-1. Feeling of burning pain or pins needles along lateral 3 and half digits especially at night.2. Weakness of thenar muscles.3. No sensory loss over thenar eminence.4. Ape thumb deformity if left untreated.5. Positive phalens and tinels sign.Phalens sign-flexion of both wrists against each other for one minute reproduces the symptoms.Tinels sign- percussion over flexor retinaculum reproduces symptoms. 