Cortical columns Flashcards
Where do all 5 of the single source divergent networks sen axonal projections?
to the cerebrum
What are the cortical columns?
Functional units comprised of groups of neurons that work together to process information
- consists of interactive layers withins the cerebral cortex
Are the large groups of neurons able to perform more complex or simple operations compared to a single neuron?
more complex
A single cortical column contains an average of how many neurons?
~100 neurons (may contain up to 140)
How many layers do each cortical column contain?
6 distinct layers according to the inputs and outputs of that layer
What do you call linked together columns?
modules
Do neurons within a column have similar responses to stimuli?
yes, they have similar receptive fields
What type of layers are I-III?
Supragranular layers
Which layers are closest to the cortical surface?
I-III
What do layers I-III do?
send reciprocal projections to other cortical columns
Are layers I-III similar to V-VI?
No, they have functionally distinct differences
Which layer divides the layers into supragranular and infragranular?
Layer IV
What does the IV layer of the cortical columns do?
Receives input from the thalamus and sends input to other layers within the cortical columns
Which layers of the cortical column are referred to as infragranular layers?
Layers V-VI
Where do the infragranular layer receive input from?
from supragranular layers of adjacent columns
Do infragranular layers send projections back to adjacent columns?
No
Where do infragranular layers project?
to extracortical areas including the thalamus and motor sensory regions
What does the Thalamus do in regards to cortical columns?
Thalamus works with the cerebral cortex to create a “feedback circuit”
What is the order of transmission from the thalamus to the columns?
infragranular layers –> thalamus –> layer IV
Information flow within the cerebral cortex is mediated by the action of what?
Supragranular neuronal layers
Additional information from the internal and external environment is integrated by what two structures?
Thalamus and the IV cortical layer
