INTRO TO CNS Flashcards Preview

Neuroanatomy > INTRO TO CNS > Flashcards

Flashcards in INTRO TO CNS Deck (17)
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1
Q

What gyri does the limbic lobe consist of

A

cingulate gyrus and the parahippocampal gyrus

2
Q

CSF is produced by…

A

ependymal cells of the choroid plexus

3
Q

What connects the 3rd and 4th ventricle

A

the cerebral aqueduct

4
Q

Between K+ and Na+ which is higher in extracellular space? intracellular space?

A

Na+

K+

5
Q

What is equilibrium potential

A

the membrane potential where concentration gradient = electrical gradient

6
Q

How do voltage-gated channels open?? where on the neuron are they found?

A

A chance in intracellular charge opens the channels

Found in the axon and axon terminals

7
Q

How do ligand-gated channels open?? where on the neuron are they found?

A

A molecule binds to a specific site on the channel causing it to open
They are mainly found in dendrites

8
Q

What are leaky channels? where are they found?

A

A channel that facilitates passive diffusion of a specific ion/molecule
found throughout the axon

9
Q

What is spatial summation

A

receives stimuli from multiple neurons close together in the same timeframe

10
Q

What is temporal summation

A

Receives repeated stimuli from on neuron in a small timefram (another stimuli is received before the initial one fades)

11
Q

what threshold does a neuron need to surpass is order to send an AP

A

-55mV

12
Q

Via what two mechanisms do APs travel towards the axon terminal

A

Active current

passive current

13
Q

What is active current

A

Voltage gated sodium channels allow the influx of sodium into the cell, leading to depolarization and the generation of an action potential

14
Q

What is passive current

A

positive charge inside the axon will move laterally down the axon as it is attracted to the adjacent negative charge. The movement of charge will then cause downstream voltage-gated sodium channels to open resulting in the generation of another action potential

15
Q

What is capacitance

A

the ability to store electrical charge between two conducting plates

16
Q

Is action potential propagation slower or quicker with lower capacitance

A

quicker

17
Q

How do you decrease capacitance

A

as the distance between the parallel plates increases - add myelin