Pneumo-gastric Nerve. The pneumo-gastric or vagus nerve has a more wide distribution than that of any other cranial nerve. It supplies branches to the pharynx, it gives off a superior laryngeal branch which is chiefly sensory in function, and the inferior or recurrent laryngeal nerve, which is the motor nerve of the larynx. It supplies the oesophagus, it gives off branches which enter largely into the supply of nerves to the heart and lungs, and its terminal branches ramify over the walls of the stomach. The vagus also communicates freely with neighbouring cranial nerves.