450 



THE INTERNAL STRUCTURE 



division is to be taken as implying that there is any 

 difference in kind between these pyramidal elements, 

 although they differ so much in size in different situations. 

 To speak of the largest of these cells only, viz., those of 

 the fourth layer as ' ganglionic ' cells, and of this layer in 

 particular as ' the ganglionic layer,' 

 carries with it misleading implica- 

 tions. Even the largest of the 

 clustered cells differs only in degree 

 from similarly- shaped cells found in 

 the layer above, and also in the same 

 layer throughout those other portions 

 of the cortex which do not possess 

 these cells in ' nests ' or clusters. 



The most consistent conclusion to 

 be drawn from these facts, by those 

 who adopt Ferrier's views, would be 

 for them to say that all convolutions 

 FIG. i6i. Section of the contain ' motor cells' and that too 

 !SE ?: in more than one layer-unless the 

 mopis). A, white fibres, me re fact of the nest-like ' grouping ' 



which here, owing to absence n /. 



of spindle and small cell of the cells in certain situations is to 



layers attach themselves im- b t k indication that SUCll 



mediately to C, the pyra- 

 midal cells equivalent to the cells have assumed ' motor functions,' 



A 



r,' stratum radiatum/corre- na ted aS ' ganglionic.' Either of 



spending to outer half of . . , 



third layer ; m, I, equiva- these positions WOuld, however, pl'O- 



be very poorly based on anything 

 like reasonable considerations. 



It is worthy of note that in the involuted grey layer of 

 the ' Hippocampus major,' the structure of the cortical 

 matter, as Meynert points out,* is extremely simplified, 



* Strieker's " Human and Comp. Histology," vol. ii. p. 395. 



