CNS - lecture 3

Question 1

excitatory neurons

Answer 1

glutamate, excite post-synaptic cell, many dendrite spines

Question 2

inhibitory neurons

Answer 2

GABA, inhibit post-synaptic cell, lacking spines

Question 3

spine

Answer 3

on dendrites, inputs drive excitation

Question 4

feedforward excitation

Answer 4

classic way we think of neural communication, one fires action potential and activates another

Question 5

feedforward inhibiton

Answer 5

activation of interneurons by excitory input. when excitation arrives, inhibitory and excitory cells are activated, prevents excitation.

Question 6

feedback excitation/inhibition

Answer 6

activated neuron in region B, feedback locally to region B to stop the activity within region B. not fires to listen to A

Question 7

lateral inhibition

Answer 7

region B fires action potential, it activates an inhibitory cell, which prevents other neurons in region B from being active. this makes sure the signal is propagated to region C and not D. (specificity)

Question 8

signal prorogation in hippocampus

Answer 8

Entorhinal cortex -> DG -> CA3->CA1-> cortex

Question 9

place cells

Answer 9

memory for a specific place, when environment shifts they remap

Question 10

Grid cells

Answer 10

based on distant estimate and cues you know where you are