Cortex II Notes.doc - Cerebral Cortex II Where are the neuronal cell bodies located in the cerebral cortex(Hint think white versus gray matter

Cortex II Notes.doc - Cerebral Cortex II Where are the...

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Cerebral Cortex II Where are the neuronal cell bodies located in the cerebral cortex??? (Hint: think white versus gray matter) Neocortex (isocortex) – outermost layers of cerebral cortex Neocortex (Isocortex) Neuron types - afferents to and efferents from cortical areas: Granular (stellate): - Star-shaped - Afferent projections (inputs) - Within the cortex Pyramidal - Pyramid shaped - Efferent projections (outputs) Organization: Horizontal laminar and Vertical columnar Figure 5-8 in Pritchard TC and Alloway KD (1999) Medical Neuroscience . Fence Creek Publ. p. 185. Outermost later is layer 1 Innermost layer is layer 6 Primary afferent layer is layer 4 (input, granular) Primary efferent layer is layer 5 (output, pyramidal) Horizontal laminar organization Six layers : I. Molecular : most superficial, mostly dendrites and axons from inner cells II. External granular : small granular and pyramidal neurons (both) III. External pyramidal : small/medium pyramidal neurons (efferent)
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