THE NERVOUS SYSTEM OF MAN. ,j 



is seen (2) a more delicate membrane called thep'a mater. 

 Between these and uniting them is still a third mem- 

 brane (3) the arachnoid. It is inflammation of these 

 membranes rather than of the brain itself that consti- 

 tutes the more acute forms of brain disease attended 

 with violent delirium. 



Main Parts of the Brain. 1. Cerebrum.— Take 

 out the brain from the skull and place it on the table 



Fig. 15. — Cerebrum seen from above. 



and remove the membranes.* Looking down on it from 

 above we see nothing but a great hemispherical irregu- 

 larly convoluted mass — the cerebrum — divided along 

 the middle into two equal halves. These are the right 



* In the absence of brain an Auzoux model will serve an excel- 

 lent purpose. 



