Ch 13 Lec 2 - Nervous System Flashcards Preview

Anatomy > Ch 13 Lec 2 - Nervous System > Flashcards

Flashcards in Ch 13 Lec 2 - Nervous System Deck (66):
1

these are like astrocytes but smaller

oligodendrocytes

2

oligodendrocytes form blank in the central nervous system

myelin

3

smallest and least common neuroglial cell

microglia

4

microglia are derived from blank cells

myeloid

5

microglia are the blank cells of the nervous system

white blood

6

main function of microglia

phagocytosis

7

columnar/cuboidal and have microvilli on luminal surface are are a neuroglial

ependymal

8

ependymal cells are joined by blank junctions

gap

9

main function of ependymal cells is to help produce blank

cerebrospinal fluid

10

associated with soma and assist with exchange of nutrients and is a neuroglial cell

satellite

11

satellite cells blank neuron from extraneous stimuli

Isolates

12

neuroglial cells that produce myelin in the peripheral nervous system

schwann cells

13

schwann cells encloses blank of longer peripheral nerves

axons

14

main function of schwann cells is to blank large PNS axons

myelinate

15

blank axons appear gray and many axons associate with a single schwann cell

unmyelinated

16

unmyelinated cells are found in the blank and are not blank cells

CNS, glial

17

axons that appear white

myelinated

18

in the central nervous system, blank myelinate part of several axons

oligodendrocytes

19

in the PNS, blank cells myelinated part of one axon

schwann

20

plasma membrane of schwann cell wrapped around axon

myelin

21

part of schwann cell that contains cytoplasm

neurilemma

22

gaps in myelin sheath

nodes of ranvier

23

myelination process starts when you are blank and then stop around age blank

young, 3

24

myelin functions to blank axons and increase blank

isolate, rate of action potential

25

the peripheral nervous system can blank a fraction of the axons

regenerate

26

the regeneration of Schwann cells in PNS

Wallerian process

27

if the injury separates axon from cell body, the blank portion of the axon will blank along with with myelin sheath

distal, deteriorate

28

during the regeneration of nerve fibers, blank clean up, some blank cells remain, and a thin blank membrane and later of blank tissue around schwann cells

macrophages, schwann, basement, connective

29

new axon grows blank to blank millimeters per day when regenerating nerve fibers

3-4

30

repair in central nervous system is more blank

limited

31

oligodendrocytes do not blank and repair the central nervous sytem

proliferate

32

blank produce scar tissue and chemicals blocking regrowth in central nervous system

astrocytes

33

ability to respond to stimuli

irritability

34

ability to transmit an impulse

excitability

35

an electrical impulse changing the permeability of a membrane

action potential

36

action potential moving down an axon

nerve impulse

37

impulse travels faster when the axon is blank and has a blank diamater

myelinated, larger

38

this functions as a control/transmission point and a site of communication

synapse

39

synapse is a site communication between any two cells with a blank

gap

40

two types of synapses

electrical, chemical

41

example of electrical synapse

intercalated discs of cardiac muscle

42

example of a chemical synapse

neuro-muscular junction

43

in chemical synapses, blank house neurotransmitters

synaptic vesicle

44

chemical synapses only exist in the blank

presynaptic cell

45

chemical synapses release neurotransmitters into the blank

synaptic cleft

46

receptors on blank membranes register the neurotransmitter in chemical synapses

post-synaptic

47

chemical synapses proliferates the blank from one cell to the next

action potential

48

in step 1 at a chemical synapse the action potential reaches the blank of the presynaptic neuron

synaptic knob

49

receive impulses from afferent fibers and the impulses are carried away on efferent fibers in these

neuronal pools

50

blank fibers can branch many times before entering a pool

afferent

51

one neuron to another in series in this pool

serial processing

52

pool when impulse leaves a pool, it may spread into several output fibers and allows impulse to be amplified

divergence

53

neuronal pool where a single nerve in pool may receive impulses from 2 or more incoming fibers

convergence

54

if an impulse leads to the same nerve, they are said to blank

converge

55

convergence allows summation of impulses from blank

different sources

56

processing information from several neurons at once

parallel processing

57

positive feedback continues activity of circuit in this pool

reverberation

58

one neuron may receive either blank and blank stimuli from multiple neurons

excitatory, inhibitory

59

the net effect of all input to a cell is called the blank

net charge

60

if the charge is positive enough to a nerve then it will result in a blank

active potential

61

the point where an action potential can be produced is known as blank

threshold

62

inhibitory stimuli bring signals blank threshold

away from

63

excitatory stimuli bring signals blank threshold

to

64

in step 2 at a chemical synapse the blank is release

neurotransmitter

65

in step 3 at a chemical synapse the blank binds to receptors and blanks the postsynaptic membrane

ach, depolarizes

66

in step 4 at a chemical synapse blank is removed by blank

ach, ache