The median nerve is formed by the union of two branches: one comes from the sixth, seventh, and eighth cervical, the other from the eighth cervical and the first dorsal. It passes clown the limb at first in front of the humeral artery, and continues its downward course in company with the posterior radial artery until a short distance above the knee. Here it divides, the inner branch forming the internal plantar nerve, the outer uniting with the ulnar to form the external plantar nerve. Its branches are distributed to- 1, the superficial pectoral; 2, a considerable branch which passes between the coraco-humeralis, to which it gives fibres, and expends itself in the biceps; 3, a branch which leaves the parent trunk at the middle of the humerus, goes to the brachialis anticus, and sends off a branch to the skin of the forearm; 4, to the flexor metacarpi internus and the flexor pedis perforans and perforatus.