d 
EXPLANATION OF CUT. 
a-a —Blood clot in fourth ventricle. 
b —Medulla oblongata. 
c —Fourth ventricle. 
d-d-d —Cerebrum. 
c —Fissure between cerebrum and cerebellum. 
The cerebellum was lifted away from the medulla ob¬ 
longata by means of the chain hooks, and as the brain is 
viewed from the posterior aspect, it shows the fourth ven¬ 
tricle. 
