Cerebral Cortex II Where are the neuronal cell bodies located in the cerebral cortex??? (Hint: think white versus gray matter) GRAY MATTER Neocortex—outermost layers of cerebral cortex (CNS of the CNS) Neuron types—afferents to and efferents from cortical areas: named for their shapes Granular (stellate): - Star shaped - Afferent projections (projections/INPUTS to the neocortex) - WITHIN cortex - Layer 4 Pyramidal: - looks like a pyramid; - Efferent projection - OUTPUTS from the neocortex - Send outputs to thalamus or to other structures - Layer 5 Organization: Horizontal laminar and Vertical columnar Gray matter is where most cell bodies sit in brain - Horizontal laminar= insight to brain function - Vertical Horizontal laminar organization Six layers : I. Molecular : mostly dendrites and axons from inner cells II. External granular : small granular & pyramidal neurons III. External pyramidal : small/medium pyramidal neurons IV. Internal granular : closely packed granular neurons V. Internal pyramidal : large pyramidal neurons VI. Multiform (fusiform) : many cell types
Figure 5-8 in Pritchard TC and Alloway KD (1999) Medical Neuroscience . Fence Creek Publ. p. 185.
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- Spring '14