What is CTS again?

There is a nerve called the median nerve that travels from the forearm into your hand through a "tunnel" in your wrist. Wrist bones form the bottom and sides of this tunnel; a ligament covers the top of the tunnel. This tunnel also contains nine tendons that connect muscles to bones and bend your fingers and thumb. These tendons are covered with a lubricating membrane called synovium, which may enlarge and swell under some circumstances. This swelling may cause the median nerve to be pressed up against this strong ligament which may result in numbness, tingling in your hand, clumsiness or pain.