IV] 



or Sensory Area 



69 



(() {{inlidticms of Meynert. 



Analysing more closely the component parts of the postcentral radiary /.one, we find, 

 in regard to the radiations of Mevnert, that two or three fibres of large size constitute the 

 main support of each fasciculus, and around these fibres of medium size are clustered. In 



FIG. 5. Radiary Zone in the Postcentral Cortex x 4 ;". 



Compared with figure 1 (precentral area) the disparity in fibre wealth is obvious. Some of the large fibres characterising 

 this cortex are shown, and it will be seen that they have a larger calibre than those in the precentral cortex, and 

 that they tend to avoid the radiations of Meynert. 



the fissure of Rolando the radiations are short, and stumpy, but still they contain large fibres. 

 It appears that as many large fibres are present in the postcentral radiations as in the 

 precentral, but the latter have the advantage in regard to the number of fibres of medium 

 size they accommodate. 



(I)} The Interradiary Plexus. 



We now come to a formation the fibre characters of which are so peculiar, that, even 

 it' the section were unlabelled, a single glance would enable one to declare that it came 

 from the " postcentral " area. It is not the appearance of the delicate fibres, constituting 



