PHYSIOLOGY. 



have lost their power. This turning of the eye inward 

 is supposed to indicate great agony ; but it rather shows 

 that all sufficing has ceased, and that the powers and 

 aation and motion are lost If we raise the eye-lid of a 

 person asleep, we shall find the eye turned in the same direc- 

 tion ; also in fainting, and in cases of suspended animation. 

 The fourth nerve is partly then under the influence of the 

 will, and partly independent of it.\ 



12. (The seventh nerve, consists of two portions, one of 

 which, the auditory, has already been described. The other 

 portion is called /octal, because it is distributed over the face. 

 Its origin has already been stated, though it receives 

 from each column of the medulla oblongata ; so that its 

 function is complicated. It seems, in fact, to combine the 

 character of a regular nerve and one of instinctive motion ; 

 it enters the internal auditory passage in connection with 

 the nerve of hearing, then entering a canal in the temporal 

 bone, it comes out just before the ear, and spreads out over 

 the face in three principal branches, called pes auarima, 01 

 goose's foot, from its resemblance to that object 



13.frhe ffih nerve is distributed to the same parts or 

 which* the/aciol is ramified on the fac^ the one serving foi 

 sensation, the other for expression. Thus when the facia 

 nerve is divided, or its functions destroyed by disease, the 

 side affected loses all power of expression, though &ensatii 

 remains unaffected ; on the contrary, if we divide the fiftl 

 pair, sensation is entirely abolished, while expression ranuBs 

 The facial nerve not only communicates the purposes of tb< 

 will to the muscles of the face, but at the same time, i 

 them into action under the influence of instinct and 

 thy. On this subject a late writer remarks, How eaqprts 

 sive is the face of man ? How clearly it announces tib 

 thoughts and sentiments of the mind ! How well deptdtei 

 are the passions on his countenance ! tumultuous rage, a&jac 

 fear, devoted lore, envy, hatred, grief, and every other 

 tion, in all their shades and diversities, are imprinted 



