Does 4 layer Allocortical Tissue have a Granular Layer?

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Graeme E. Smith
Graeme E. Smith's picture
Does 4 layer Allocortical Tissue have a Granular Layer?

I am trying to confirm a number of hypothesis about the nature of Allocortical tissue, Some articles suggest that some allocortical has 3 layers, and some 4, assuming that they were looking at different areas of Allocortical tissue, I assume that there might be areas that have both architectures. The only model I have of how an allocortical tissue should react, is a 4 layer version, but I have abstracted back from Isocortical tissue the hypothesis that the 4 layer Allocortical Tissue has a granular layer. If this is correct, then I can adjust the model for Three Layer Allocortical Tissue, using a hypothesis that suggests why agranular tissue is different from Isocortical tissue.
So the question I have, is, does anybody know specific areas of Allocortical Tissue in the brain that have 4 layers, and if they do, does the 4th layer seem to be a granular layer like the 4th layer of Isocortical Tissue.

Shampa
Shampa's picture
Basically what the present

Basically what the present knowledge is there is that there are 3 layers. In old books many authors present 4 layers and it was due to the fact that the 4th layer (as they said) was made of the two types of cells that form the adjacent layers.

Graeme E. Smith
Graeme E. Smith's picture
Are you saying that the third

Are you saying that the third layer mixed granular and Pyramidal cells? You started talking about adjacent layers and lost me.