390 NERVOUS SYSTEM. 



Although there are many facts in pathology which are 

 opposed to the view that the cerebellum presides over the 

 generative function, there are numerous cases which go to 

 show a certain connection between this portion of the central 

 nervous system and the organs of generation in the human 

 subject. But this is all that we can say upon this im- 

 portant point ; certain it is that the facts are not sufficiently 

 numerous, definite, and invariable, to sustain the doctrine 

 that the cerebellum is the seat of the sexual instinct. 



Development of the Cerebellum in the Lower Animals. 

 The study of the comparative anatomy of the cerebellum has 

 little physiological interest, except in so far as it bears upon 

 our knowledge of its physiology. From this point of view, 

 there is little to be said concerning its development in the 

 animal scale. We can hardly establish a definite relation 

 between this particular part of the encephalon and the corn- 

 plicated character of the muscular movements ; for, as we 

 pass from the lower to the higher orders of animals, we have 

 other parts of the brain, as well as the cerebellum, devel- 

 oped in proportion to the increased complexity of the mus- 

 cular system. !Nor can we connect the comparative anatomy 

 of the cerebellum with the ideas of the functions of this organ 

 in connection with generation. The amphioxus lanciolatus 

 has no cerebellum, and this organ, therefore, is not indis- 

 pensable to generation. In some animals remarkable for 

 salacity, the cerebellum is not unusually large ; and facts of 

 this kind might be multiplied ad infinitum. 



Paralysis from Disease or Injury of the Cerebellum. It 

 is not unusual to observe disorganization of a considerable 

 amount of cerebellar substance without paralysis ; and, 

 indeed, we are inclined, upon this point, to adopt the view 

 advanced by Yulpian, that, of itself, disease of the cerebellum 

 is not attended with hemiplegia, this condition obtaining 

 only when the peduncles, the pons ; or the motor tracts of 



