The tunnels in your arm hold the nerves and tendons in place. The carpal (or wrist) tunnel is formed by an arch of bones and a ligament. A tight tunnel puts pressure on the nerve. The nerve starts to work less well over many, many years.

The tunnels in your arm hold the nerves and tendons in place. The carpal (or wrist) tunnel is formed by an arch of bones and a ligament. A tight tunnel puts pressure on the nerve. The nerve starts to work less well over many, many years.