Thalamus/EEG (Thalamus as the Gateway to Consciousness) Flashcards Preview

Mo-Neuro 4 > Thalamus/EEG (Thalamus as the Gateway to Consciousness) > Flashcards

Flashcards in Thalamus/EEG (Thalamus as the Gateway to Consciousness) Deck (19):
1

during ________, a large part of the sensory information is not relayed to cortex.

deep sleep

2

when the animal’s fight or flight system is engaged sensory information is
relayed to ______ processed optimally for quick decision making.

cortex

3

________ is a type of epilepsy
prevalent in children where the child has sudden staring spells.

Absence epilepsy

4

Levetiracetam, Keppra

x

5

when you observe the EEG pattern of a patient with absence epilepsy during the starting episode it is strikingly similar to that of _____`__________

slow wave sleep (δ waves of ~3 Hz)

6

Because the thalamus is deep in the ____________ the EEG cannot report on its activity directly

diencephalon

7

EEG Measures?

Surface activity of the brain in Voltage

8

Voltage =

V=IR
i= current
r=restince

9

EEG: Cortex i1, i2, i3

All add up= i (i=current)
Veeg= i(r)
occurs because this is an organized area of cells

10

Thalamus affects activity of cortical neurons through axonal connectivity between the thalamus and the cortex, thus....

Thalamus can be seen on EEG????
~I think that's what he means

11

The channel responsible
for the slow Ca2+ spike is a ______

T type Ca2+ channel.

Voltage gated- it is
inactivated by depolarization.

Thalamic relay neuron

12

Thalamic relay (TR) neurons are cells located in the thalamus that receive an input from a sensory system and relay that information to cortex via
excitatory glutamatergic synapses onto:

pyramidal
cortical neurons with soma in layer IV of cortex

13

When the cell is hyperpolarized by the action of the thalamic reticular cells the inactivation gate opens and the T type Ca2+ channel will generate Ca2+ spikes at a frequency:

of ~3 Hz

14

on top of the slow T type Ca2+ spike are several fast action potentials (an action potential “burst”).

B/c thalamic relay neuron’s axon connects to the cortical pyramidal cell the burst of firing of action potentials in the TR cell elicits firing of the cortical pyramidal cell at a δ frequency eliciting the slow wave EEG that is recorded
during slow wave sleep

15

Thalamic relay (TR) neurons are cells located in the thalamus that receive an input from a sensory system and relay that information to cortex via ___________ onto pyramidal
cortical neurons with soma in layer IV of cortex

excitatory glutamatergic synapses

16

T type Ca channel can do what?

Can activate K channels
????

17

______are low-voltage activated channels that open during membrane depolarization.

T-type calcium channels

18

Cells located in the thalamus that receive an input from a sensory system and relay that information to cortex via excitatory glutamatergic synapses onto pyramidal
cortical neurons with soma in layer IV of cortex

Thalamic relay (TR) neurons

19

Inactivate gate T type channel closes at

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