98 NERVOUS SYSTEM. 



Q. What are the principal pathological states of the 

 brain? 



/#. The brain is diminished in concussion, so as not to 

 fill the cranium. The brain is subject to a softening, as well 

 as to an induration of its substance. The brain suppurates, 

 forms tumours, tubercles, osseous depositions. BICHAT 

 had the lobes of the brain of very unequal size. The 

 nerves are enlarged in some cases, and atrophic in others. 

 The nerves cicatrize, but are never preternaturally pro- 

 duced. 





II. NERVOUS SYSTEM OF ORGANIC LIFE, 

 General Remarks. 



Q. How should the ganglions be considered? 



*fl. Each as a distinct centre distributing or receiving 

 nerves. 



Q. How does the system of organic nerves differ from 

 the nerves of animal life? 



,#. In the system of animal life the brain is a single 

 centre; in that of organic life there are as many centres 

 as ganglions. In animal life the nerves are symmetrical, 

 in the organic system they are irregular. The nerves of 

 organic life do not serve for sensation, as those of animal 

 life do. The nerves of organic life have no connexion 

 with voluntary locomotion, the animal nerves control this. 

 The organic system of nerves belongs to internal life, the 

 animal nerves to the external or life of relation. Lastly, 

 ganglions are not found in the head. 



