THE PONS AND THE CEEEBELLUM. 331 



They are characterized only through especial intensity. Among the symp- 

 toms are: Choked disk, which frequently leads to blindness; headache, 

 especially in the back part of the head and frequently accompanied by stiff 

 neck; obstinate emesis; conyulsions, usually tonic and with opisthotonos. 



When the symptoms are pronounced the diagnosis is ustially easy. 

 The "neighborhood-symptoms" are, through iheir significance, of great 

 importance. In order to establish the diagnosis of cerebellar disease the 

 local symptoms must naturally precede the "neighborhood-symptoms." 

 The last alone not infrequently permit a diagnosis of the side of the cere- 

 bellum diseased. 



Diseases of the corpora quadrigemina may give rise to the same phe- 

 nomena as those caused by diseases of the cerebellum. Here ataxia occurs 

 only after ophthalmoplegia — the reverse of the ease with affections of the 

 cerebellum. An ataxia due to affections of the cerebrum may be quite like 

 the cerebellar ataxia; here the other symptoms indicate disease of a cerebral 

 hemisphere (Bruns). 



