Carpal tunnel syndrome (CTS) is a common condition that still lacks a reliable, objective screening test. Many anatomical aspects of the syndrome have been studied including the dimensions of the carpal tunnel and shape of the nerve within the tunnel. The investigators have observed varying amounts of muscle overlying the carpal tunnel in patients undergoing surgery for the condition. Assuming that this muscle may have a dynamic role in the development of the condition, the investigators attempted to quantify this muscle using ultrasound (US).