The carpal tunnel is a narrow passageway in the wrist that is made
of bones on three sides and a ligament (transverse carpal ligament) across the
wrist where the palm and forearm meet.
Inside the tunnel are:
- Tendons, which are strong and flexible (but not
stretchable) bands of tissue that connect muscle to bone. The tendons are
surrounded by membranes (synovial membranes called tendon
- The median nerve, which controls some movement in the
thumb and gives sensation to the thumb, index finger, middle finger, and half
of the ring finger.