Anatomy of the<unk>  tunnel, showing the median nerve passing through the tight space it shares with the finger tendons The<unk>  tunnel is an anatomical compartment located at the base of the palm. Nine flexor tendons and the median nerve pass through the<unk>  tunnel that is surrounded on three sides by the<unk>  bones that form an arch. The median nerve provides feeling or sensation to the thumb, index finger, long finger, and half of the ring finger. At the level of the wrist, the median nerve supplies the muscles at the base of the thumb that allow it to abduct, move away from the other four fingers, as well as move out of the plane of the palm. The<unk>  tunnel is located at the middle third of the base of the palm, bounded by the bony prominence of the scaphoid tubercle and trapezium at the base of the thumb, and the hamate hook that can be palpated along the axis of the ring finger. From the anatomical position, the<unk>  tunnel is bordered on the anterior surface by the transverse<unk>  ligament, also known as the flexor retinaculum. The flexor retinaculum is a strong, fibrous band that attaches to the pisiform and the hamulus of the hamate. The proximal boundary is the distal wrist skin crease, and the distal boundary is approximated by a line known as Kaplan's cardinal line. This line uses surface landmarks, and is drawn between the apex of the skin fold between the thumb and index finger to the palpated hamate hook.
Carpal tunnel syndrome
Radial tunnel syndrome
Ulnar tunnel syndrome
Calpainopathy
Tarsal tunnel syndrome
Sciatica
Median nerve palsy
Anterior interosseous syndrome