A U-shaped cluster of eight bones at the base of the palm forms the hard, rigid floor and two sides of the tunnel. A very strong ligament, tough as bones, lies across the arch of carpal bones, forming the roof of the tunnel. This nerve conducts sensation from the hand, up the arm, to the central nervous system. When the nerve is compressed at the wrist the hands and fingers are affected. The motor branch of the median nerve controls the muscle surrounding the thumb.
Damage affects the hands ability to grasp large and small items.
The nine tendons have a lubricating lining which allows the tendons to slide back and forth through the tunnel as the wrist and fingers are used. According to Troop there are many reasons why Carpal Tunnel Syndrome occurs. Wear and tear due to repetitive actions such as, typing, knitting, writing, and driving. Bone dislocation and fracture Previous dislocation or fracture of the wrist causes bone to protrude into the tunnel. This occurs most often during pregnancy, with symptoms subsiding after delivery.