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exterminate > cells of the NS > Flashcards

cells of the NS Flashcards

0
Q

what are astrocytes?

A

cells of the NS that form the blood brain barrier

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1
Q

What type of cell supports and protects neurons

A

neuroglia or glial cells

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2
Q

what is the structure of an atrocyte?

A

feet that cover the surfaces of neurons and blood vessels and the pia mater

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3
Q

what is the fn of an astrocyte?

A

by producing chemicals that promote tight jncts, astrocytes form the blood-brain barrier to regulate what substances reach the CNS from the blood; also helps regulate extracellular spinal fluid composition

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4
Q

what type of NS cell supports and protects the neurons?

A

glial cells or neuroglia

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5
Q

what does the blood-brain barrier do?

A

it protects neurons from toxins, allows exchange of nutrients and waste products between blood stream and neurons

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6
Q

what type of NS cells regulate the extracellular brain/spinal fluid composition?

A

astrocytes

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7
Q

what do ependymal cells do?

A

line brain ventricles and spinal cord central canal

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8
Q

specialized versions of what type of NS cell form the choroid plexuses?

A

ependymal

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9
Q

what type of cells in the NS form the blood-brain barrier?

A

astrocytes

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10
Q

what type of cells regulate extracellular brain fluid composition?

A

astrocytes

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11
Q

what does the choroid plexus do?

A

secretes cerebrospinal fluid

cilia move the fluid through the cavities of the brain

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12
Q

where is the choroid plexus located?

A

certain regions of ventricles

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13
Q

what type of cell is the microglia?

A

specialized macrophages

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14
Q

what brain region secretes and moves cerebrospinal fluid and is made of specialized ependymal cells?

A

choroid plexus

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15
Q

ependymal cells of the___________ secrete cerebrospinal fluid

A

choroid plexus

16
Q

what do microglia do?

A

respond to inflammation

phagocytize necrotic tissue, microorganisms and foreign substances that invade the CNS

17
Q

what are the specialized macrophages of the NS?

A

microglia

18
Q

what type of NS cell responds to inflammation?

A

microglia

19
Q

microglia are responsible for phagocytizing

A

necrotic tissue
microorganisms
foreign substances

20
Q

what do oligodendrocytes do?

A

form myelin sheaths around portions of 1 or more axons

21
Q

what type of NS cell forms the myelin sheaths?

A

oligodendrocyte

22
Q

what are neuroglia?

A

non neuron cells that work to support the nervous system (myelin sheath, macrophage, blood-brain barrier)

23
Q

compare and contrast oligodendrocytes and neurolemmocyte?

A

both form myelin sheaths by wrapping around neurons
both form protection from current of AP which makes the AP propagate more quickly (saltatory)
oligodendrocytes are only in CNS (brain, spinal cord)
neurolemmocytes are in the PNS

24
Q

what type of cell forms the myelin sheaths of neurons in the CNS?

A

oligodendrocyte

25
Q

what is another name for neurolemmocyte?

A

schwann cell

26
Q

what is myelin made of that makes it so insulating?

A

lipids (80%)

27
Q

how is a myelin sheath formed?

A

oligodendrocytes or neurolemmocytes wrap many times around an area of a neuron up and down the entire length of neuron, creating nodes of ranvier in between

28
Q

what is the fn of satellite cells

A

surround neuron cell bodies in the ganglia to provide support and nutrients

29
Q

what type of cell surrounds neuron cell bodies in the ganglia to provide support and nutrients

A

satellite cells

30
Q

what is myelin’s purpose?

A

to insulate axons from each other and to speed transmission (saltatory propagation)

31
Q

what is gray matter made of?

A

unmyelinated axons

32
Q

what type of neurons do not have oligodendrocytes or neurolemmocytes wrapped around them?

A

unmyelinated axons (gray matter)

exterminate (10 decks)

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