Physiology: neuronal networks

Question 1

FEEDBACK PATHWAYS
Why are they important?

Answer 1

Enable the regulation of neurons

Question 2

FEEDBACK PATHWAYS
Describe feedback pathwa

Answer 2

Presynaptic neuron –> excitatory post synaptic neuron

Excitatory post synaptic neuron –> inhibitory neuron –> excitatory postsynaptic neuron

Question 2

FEEDBACK PATHWAYS
Why are they important?

Answer 2

Enable the regulation of neurons

Question 3

FEEDBACK PATHWAYS
Describe the feed forward pathway

Answer 3

Pre synaptic neuron –> inhibitory neuron –> excitatory postsynaptic neuron

Presynaptic neuron –> excitatory postsynaptic neuron

Question 4

FEEDBACK PATHWAYS
Describe the lateral inhibbition pathway
What is the function of this pathway?

Answer 4

Presynaptic neuron –> excitatory post synaptic neuron

Excitatory post synaptic neuron –> inhibitory neuron –> populations of excitatory neurons –> excitatory post synaptic neuron

Fine tunes inputs

Question 5

FEEDBACK PATHWAYS
Can they occur at different levels?

Answer 5

Yes, eg.
- Autoregulation
- Between adjacent cells
- Between cortical areas

Question 6

CONVERGENCE AND DIVERGENCE
Differentiate convergence and divergence

Answer 6

Question 7

CONVERGENCE AND DIVERGENCE
2 examples of convergence?

Answer 7

Purkinje cells in the cerebellar circuits (highest degree of convergence in the mammalian CNS)
Inputs to the striatum in the basal ganglia

Question 8

THE FUNDAMENTAL CORTICAL MICROCIRCUIT
How many layers are there of the cerebral cortex?
Is it repeated many times throughout the cortex?

Answer 8

6
Yes

Question 8

FEEDBACK PATHWAYS
Why are they important?

Answer 8

Enable the regulation of neurons