Add the median nerve which enters the hand via the carpal tunnel, deep to the flexor retinaculum, between the tendons of the flexor digitorum superficialis and the tendon of the flexor carpi radialis. The median nerve supplies motor fibers to 2.5 thenar muscles and the first and second lumbrical muscles. It sends cutaneous, sensory fibers to the entire palmar surfaces and sides of the thumb, index finger, middle finger, and lateral half of the ringer finger; and to the dorsum of the distal halves of these fingers.
