189 



Fig. 1. Immediately 

 behind the meeting 

 of Sulcus calcari- 

 nus and sulc. pa- 

 rieto-occipitalis. 



Fig. 2. 6 mm. behind lig. 1, 



Fig. 3. IV'oCm. 

 behind fig. 2. 



Fig. 4. 6V2 nim. 

 behind fig. 3. 



Fig. 5. 3 mm. behind fig. 4. 



V = Ventricle (posterior shell). 

 Ca = Sulcus calcarinus. 



Fig. G. 4 mm. behind 

 fig. 5; occipital pole. 



We remarked however that in the immediate neighbourhood of 

 the area striata (area 17 Brodmann) the cortical area (18 Brodmann) 

 shows a less beauliful development in its large supragranular pyramids 

 than one sees normally. Also in comparison with corresponding 

 sections through this region of an idiot that was not blind, this 

 difference continues to exist. 



If we summarise our discoveries, it appears that the primary- 

 optical centra show the deviations that are typical for the consequences 

 of the early enucleation of the two eye-globes on both sides. More- 

 over that part of these nuclei that is connected with the cerebral 

 cortex, though it may be ever so reduced, has not changed its 

 nature. Entirely in keeping with what might be expected on these 

 grounds, the nucleocortical connection — on account of the diminut- 

 iveness of the composing fibre-elements — though it has diminished, 

 in volume, is very distinctly extant. It is exactly the same with the 

 regio calcarina, if not exclusively (according to our view) yet very 

 predominantly (Winkler) ^) the boundary of the geniculo-cortical 



1) Winkler: Over gelocaliseerde atrofie i. h. corp. geniculatum. Versl. K. Ak. 

 V. Wetensch. 1912, bldz. 714. 



