4. Part of the glosso-pharyngeal supplies the tongue and pharynx. 5. The gustatory, lingual branch of the fifth, supplies the tongue, sense of taste. II.--Nerves of common sensation: 1. The ophthalmic supplies the eye. 2. The superior maxillary supplies the upper jaw and teeth. 3. The inferior maxillary supplies the lower jaw and teeth. III.--Nerves of motion: 1. The third nerve, motor acuti. } } 2. The fourth nerve, trochlear or } Supply the muscles pathetic. } of the eye. } 3. The fifth, branch of fifth. } } 4. The sixth, abducers. } 5. The facial nerve supplies the muscles of the face. 6. The hyperglossal supplies the muscles of the tongue. IV.--Mixed nerves: 1. The pneumogastric supplies lungs, heart, stomach, larynx, etc. 2. The spinal accessory supplies some muscles of the back. The average weight of the brain in the adult male is about 49 1/2 ounces, a little more than three pounds avoirdupois; in the female 44 ounces; the average difference between the two being from 5 to 6 ounces. The spinal cord has a length of about 16 to 17 inches, and weighs about 1 1/2 ounces. The spinal cord is a continuation of the medulla oblongata, is lodged in the spinal canal, and gives off 31 pairs of nerves, that supply all the muscles of the body with sensitive and motor nerves. The medulla oblongata is pyramidal in form, having its broad extremity upwards. It is expanded laterally at its upper part. Its length from the pons varolii to the lower extremity of the pyramid is about an inch and a quarter; its greatest breadth is nearly an inch; and its thickness from before backwards is about three-quarters of an inch. The medulla is the link between the brain and the spinal cord. The majority of centers for various organic functions are situated in it; as follows: 1. The respiratory center, with its neighboring convulsive center (venous blood excites convulsive centers, etc.). 2. The vaso-motor center. 3. The cardiac-inhibitory center. 4. The diabetic center, or center for producing artificial diabetes. 5. The center for deglutition. 6. The center for the movements of the æsophagus, with its vomiting center. 7. The center for reflex excitation of the secretion of saliva, with which may be associated the center through which the væjus (pneumogastric) influences the secretions of pancreatic juice, and possibly of the other digestive juices. 8. The center for the dilation of the pupil by means of the cervical sympathetic. From the surface of the medulla certain of the cranial nerves arise, namely the sixth (abducens), glosso-pharyngeal, pneumogastric, spinal accessory, etc. The fibers from the spinal cord pass upwards through the medulla oblongata and various other structures and finally reach the cerebrum.