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Flashcards in Glia Deck (21):
1

are glia excitable or non excitable

Non excitable

2

what are the two group of glia in the cns

macroglia and microglia

3

what germ layer gives rise to macroglia

Ectoderm

4

what germ layer gives rise to microglia

Mesoderm

5

give two examples of macroglia

astrocytes and oligodendrocytes

6

what groups of glia are found in the pns

1) schwann cells - non-excitable, excitable

2) olfactory sheathing

3) satellite glial cells

4) enteric glia

7

where do astrocytes extend projections to

nodes of ranvier (axons), dendrites, neural vascular endothelium, under pia mater

8

a single astrocyte makes contact with multiple dendrites of a neuron. true or false

true

9

a single neuron is contacted by multiple astrocytes. true or false

true

10

the presence of which neuronal cell type causes an immature schwann cell to develop into a myelinating cell

neurons

11

can schwann cells turn into immature schwann cells after injury?

Yes

12

microglia are derived from what type of cells

foetal macrophages

13

during embryonic development, embryonic glial cells invade what structure

Neural tube

14

after birth, what structure in the brain do microglia precursor cells invade

corpus callosum

15

give to examples of neuropeptides secreted by glial cells

Angiotensinogen

Atrial natriuretic peptide

16

what does wiring transmission refer to in context of glia

wiring transmission is a form of transmission/signalling

it is:

only intracellular
between only two cells
rapid

17

what is volume transmission in the context of glia

form of transmission/signalling

it is:

intracellular and extracellular
between more than two cells
(a signal released in one cell affects many others)
slow

18

following an action potential, extra extracellular potassium is taken up by which cells

Astrocytes

19

astrocytes have a high potassium conductance. true or false

True

20

how is potassium taken up into astrocytes

1) potassium channels

2) Na/K ATPase pump

3) Na/K/2Cl exchanger

21

after one astrocyte takes up extracellular potassium, the K diffuses between cells through gap junctions. true or false? what is the name of this process

true. spatial buffer