THE NERVOUS SYSTEM 347 



7th pair.— The facial, being the great motor nerves of the 

 face. 



8th pair. — The auditory, which go to the ear, and supply the 

 special sense of hearing. 



9th pair. — The glossopharyngeal, being the mixed sensory 

 and motor nerves that go to the tongue, pharynx, etc. 



10th pair. — The pneumogastric or par-vagum, being mixed 

 nerves that supply stomach, heart, lungs, pharynx, 

 trachea, etc. These are very important nerves. 



nth pair. — The spinal accessory, which are motor nerves. 



1 2th pair. — The hypo-glossal, which supply the tongue, and 

 are also motor nerves. 



565. Although the brain is the seat of emotion, reason, and 

 sensation, it is of itself non-sensitive, as portions of it may be cut 

 away with little or no effect. I remember a case where a groom was 

 thrown from a horse, and kicked on the side of the head just above 

 the left ear ; the skull was driven in, and a portion of the brain pro- 

 truded i-| inches. It could be handled with the fingers without 

 causing the patient any uneasiness, yet, if his lips were touched, the 

 body was thrown into frightful contortions, he being at the time 

 semi-conscious. The protruding portion was left alone, when it 

 gradually receded, and within a week had returned to its proper 

 place, a splendid recovery being made. 



DISEASES OF THE BRAIN AND NERVOUS 



SYSTEM. 



566. The Functional Derangement and Diseases of the brain 

 and nervous system are not of so frequent occurrence in the domestic 

 animals as they are in the human subject, yet, from their peculiarity 

 and obscurity, they are most interesting, arising as they do from a 

 great variety of causes. Functional disturbance is, in many cases, due 

 to reflex action, the real cause being very remote from the brain — as, 



