HMB200H1 Lecture Notes - Lecture 19: Arcuate Fasciculus, Parahippocampal Gyrus, Visual Cortex

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15 Aug 2012
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Cortex go from 3 layers to 6 layers, very difficult to define. How it evolved from limbic cortex to association cortex! Evolution of cerebral cortex how layers have evolved. Archicortex & transitional: e. g. medial prefrontal, insular, hippocampus. Transitional: includes hippocampus (evolved from paleocortex, slightly thicker), orbitofrontal cortex which evolves to primary cortex. Primary: difficult for anatomists to find these layers: can see layers iii & iv dominant here since receiving direct thalamic visual & auditory input. Oldest dortex = basal forebrain colonoergic 0. 5mm, thinnest cortex. Paleocortex: 3 layers: gradual transition to 6 layers as layers added on over long time. Transitional cortex: 3 6 layers: hippocampus = highly developed, has 3 or 4 layers. Primary neocortex: somatic inputs from thalamus: evolved from hippocampal to 6 layers. Association neocortex: cortical and non-primary thalamus inputs (mediodorsal n, pulvinar) Distribution of functional zones in relation to brodmann"s map of human cortex.

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