Neuroglia & glial cells Flashcards Preview

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Flashcards in Neuroglia & glial cells Deck (12):
1

Neuroglia
provide? how many? located? known as? what don't they do?

aka glial cells
provide various support functions to neurons
5-50 times more numerous than neurons
found in CHS & PNS
DO NOT conduct or carry impulses
readily multiply & divide
"glue" of nervous tissue

2

what are the 4 types of neuroglia in the CNS

astrocytes
oligodendrocytes
microglia
ependymal cells

3

astrocytes
functions? description? attached to?

star shaped, largest & most numerous
attached to blood capillaries & neurons
-restricts movement of substances btwn blood & neurons of CNS (cerebrospinal fluid)
provide nutrients to neurons (blood carries nutrients)
regulate ion concentrations
remove excess neurotransmitters (too much ACh is bad)

4

oligodendrocytes
function?

produce & maintain myelin

5

Microglia
description? job?

(small)
spine-like projections
acts as phagocytes
-remove damaged nerve tissue & invading microbes

6

Ependymal cells
description? location? function?

simple squamous or columnar shape
have cilia
line brain ventricles & central canal of spinal cord
-protects & nourishes CNS
produce & assist in circulation of cerebrospinal fluid

7

2 types of neuroglia in PNS are?

Schwann cells
Satellite cells

8

Schwann cells

form myelin sheath around axons
aids in regeneration of damaged PNS nerve fibers (usually sensory)

9

Satellite cells

flat cells, surround cell bodies located in PNS ganglia
provide structural support
regulate exchanges of material btwn cell body & interstitial fluid

10

whats interstitial fliud?

fluid btwn surrounding cells

11

what can neurons not do that neuroglia can

neurons cannot readily multiply & divide

12

what does it mean by neuroglia being the glue of nervous tissue?

held together
purple in microscope= neurons, surrounding= neuroglia