Cerebral Cortex layers Flashcards
layer I is also known as
molecular layer
layer II is also known as
external granule layer
layer III is also known as
external pyramidal layer
layer IV is also known as
internal granule layer
layer V is also known as
internal pyramidal layer
layer VI is also known as
multiform layer
layer I contains
mostly axons
layer II contains
granule (stellate) cells
layer III contains
primary pyramidal cells
layer IV contains
main granular cell layer
layer V contains
dominated by giant pyramidal cells
layer VI contains
all types of cells: pyramidal, stellate, fusiform
three major cells types
pyramidal cells, granule cells and fusiform cells
pyramidal cells function
source of corticospinal projections. major efferent cell
granule cells function
short axons - function as interneurons (intra cortical processing)
excitatory granule cells release
glutamate
inhibitory granule cells release
GABA
fusiform cells function
least numerous. give rise to output fibers from cortex
most output leaves cortex via
V and VI
spinal cord tracts originate from layer
V
thalamic connections from layer
VI
most incoming sensory signals terminate in layer
IV
most intracortical association functions in layers…
I, II, III
large number of neurons in
II, III - short horizontal connections with adjacent cortical areas
