48 STUDIES ON THE CENTRAL NERVOUS SYSTEM 



of this type. They belong to the group of neocerebellar 

 atrophies of H. Vogt. 



About the same time the ontogenetic studies of van 

 Valkenburg showed, that the growth and the ripening of the 

 cortex cerebelli in the human foetus differs in the neocere- 



Paraflocculus 



Fig. 11. Case I of Neocerebellar Atrophy 

 Extension of the atrophied area, drawn in the scheme of Bolk. Striped = 

 atrophied. 



Fig. 12. Ripening of the Cortex Cerebelli 

 Black = palaeocerebellum. Striped = neocerebellum. (After van 

 Valkenburg, drawn in the scheme of Bolk.) 



bellum and in the palaeocerebellum. The various layers of 

 the cortex begin to ripen in the palaeocerebellum, the 

 neocerebellar part comes later. This is also the case with 

 the myelinisation of the human foetus. Figure 10 shows the 



