The 6 layers of Neocortex:
Orientation of layers:
Idea about the layers:
Layers | Components | Afferents | Efferents | |
I – Molecular | Axons and Dendrites (Cell processes) | From other regions of Cortex and Brainstem | To other regions of cortex (Intra-cortical Association functions) | |
II – External granular | Densely packed Stellate cells + Small pyramidal cells | |||
III – External pyramidal | Loosely packed Stellate cells + Medium pyramidal cells | |||
IV – Internal granular | Densely packed Stellate cells only | + From Thalamus | ||
V – Internal pyramidal | Large pyramidal cells only (few stellate cells) – Giant Pyramidal cells of Betz | + From Brain stem | To Brain stem & Spinal cord (Projection fibers) | |
VI – Multiform | Multiple sized pyramidal cells + Loosely packed stellate cells | To Thalamus |
The 3 layers of allocortex:
Allocortex is found in: Limbic system
Mesocortex: A transitional type of 3 to 6-layered cortex between neocortex and allocortex –
- Parahippocampal gyrus
- Pre- and Para-subiculum
- Insula
Neurons of the cortex:
Bands of Baillarger: Formed by high concentration of horizontally arranged nerve fibers.
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