Tunnels and Tendons of the Elbow Wrist and Hand

To reach the finger, nerves must pass out through the bones and pass by discs of the neck; through muscles on the sides of the neck (scalenes); around bony prominence at the shoulder (attachment for pectoralis minor), through the cubital tunnel at the elbow (wrist flexors and extensors); and through the carpal tunnel at the wrist.

Tendons of the wrist and hand need to slide and glide through tunnels that hold the tendons close to the bones in order for their pull to be effective.