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Med Neur 2 > structure and function of peripheral sensory receptors > Flashcards

structure and function of peripheral sensory receptors Flashcards

1
Q

Dorsal root ganglion: is part of_____ thus somatosensory is in the ______ system

A

PNS

PNS

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2
Q

sensory pathways go up in ______ tracts

A

myleinated

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3
Q

Sensory neurons of PNS had their cell bodies in

A

DRG

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4
Q

Neurons of somatorsentory innervate where

A

neck and below

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5
Q

type of cell boy of DRG

A

pseudounipolar

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6
Q

Mechanoreceptors, thermoreceptors, nocireceptors are what type of sensory receptor

A

Exteroreceptive

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7
Q

Proprireceptirve sensory receptors deal with

A

muscle lenght, tension

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8
Q

Visceral afferents that localize pain and sensation poorly are part of

A

Interoreceptive category

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9
Q

Area in periphery where an adequte stim cauases a respone

A

receptive field

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10
Q

How does Pancinian corpuscle work

A

detects vibration–> activate ion chans–>generates AP

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11
Q

frequency of action potential firing per neuron

A

Rate code

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12
Q

number of neurons firing–> info sent to sp cd and summated together

A

Spatial summation Code

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13
Q

Action potential speed

A

conduction velociy

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14
Q

A-alpha and A beta are

A

large myleinated finbers

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15
Q

Abetta fibers for

A

skin: light touch, vibration, pressure

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16
Q

Thin myelinated fiber A delta have____ ocnduction

A

medium conduction

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17
Q

Fast pain cooling receptors (nocirecpetors) are

A

A delta fibers

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18
Q

Unmyelinated C fibers are

A

slow

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19
Q

nocireceptors (slow pain); warm recpetors are

A

unmyelinated C fibers

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20
Q

Compound Action potential is clinical diagnostic tool for

A

recordig whole peripheral nerve

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21
Q

Compound AP potential tool determines

A

is axon is missing, damaged or demyelinated

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22
Q

to things that determine sensitivity and function of skin nerve endinds

A

location: superfiical or deep

ending; capsulated or non-capsulated

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23
Q

sustained unchanging stimulus , from pressure or shapes of objects

A

Slowly adapting

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24
Q

Resposne to changing stimulus, such as impact, motion of objects

A

Rapidly adapting

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25
Q

what does spatial resolution depend on

A

Receptive field size of each neuron and innervation density

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26
Q

sensitive areas are usually:

A

high density of receptors

small size recepive fields

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27
Q

mechanoreceptors have
____ threshold
______respond to pain
________ unless stimulated

A

low
don’t
silent

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28
Q

These guys are great for fine touch, 2 pt discrimination

A

Merkels disk

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29
Q

how are merkels discs innervated

A

1 axon per several disks

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30
Q

Merkel discs are _______ adapting response

A

slowly

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31
Q

what is the receptive field for merkels disc

A

several, small sensitive touch domes

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32
Q

high density of these in the finger tips, lips and mouth

A

merkel discs

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33
Q

Great for sharp resolution of texture, surface of objects like bumpy vs braile

A

merkels discs

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34
Q

Good for 2 pt and sensing change in edges, bumps and corners of objects

A

Meissners corpuscles

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35
Q

these are in glabrous skin only

A

meissners corpuslces

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36
Q

what is the receptive field for meissners corpuslces

A

single spot

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37
Q

Meisnners corpuscles found in high densitiy in:

A

finger tips, lips and mouth

38
Q

These guys enclose stacks of schwann cells

A

meissners corpuscles

39
Q

good for sensing edges/corners and bumps to lift and release objects

A

Meissners corpuscles (superficial)

40
Q

merkels disk are superficial or deep

A

superficial

41
Q

the receptive field for meissners corpuslcles

A

single spot

42
Q

for Meissners corpuscles, the # of AP’s fired it

A

times skin indented

43
Q

Meissners are slow or rapid adapting

A

rapid

44
Q

these guys sense streth of skin and sense gravity force against skin

A

Ruffiini corpuscles

45
Q

ruffini corpuslces located

A

deep in dermis

46
Q

Receptive filed for Ruffini corpuscles are

A

large and diffuse

47
Q

stretch of skin sensed by

A

ruffini corpuscles

48
Q

good for sense of gravity force against skin

A

ruffinnii corpuslces

49
Q

what’s the receptive field like for ruffinni corpuscles

A

large and diffuse

50
Q

Ruffinni corpuslces axons do this

A

surround collagen fibils

51
Q

Ruffini use what type of fiber

A

Abetta slow adaptors

52
Q

this stretches skin and dertermines what you graspoed

A

ruffinni

53
Q

pancinian corpuscles are superficial or deep

A

deep

54
Q

extremely sensitive, good at detectin high frequency

A

panciana corpuscles

55
Q

receptive field for pancian corpuslces

A

very large and diffuse

56
Q

large fluid filled capsule wrapped around bare nerve ending, capsule filters out sustained stimulil

A

pancinian

57
Q

pancianan is rapid/slow adapting

A

rapid

58
Q

Receptive field has axons wrapped around base of follicle

A

hair follcle receptor

59
Q

Hair follicle receptors are rapid or slow adaptigin

A

rapid

60
Q

Hair fibers can be

A

Abetta or A gamma

61
Q

these two do good job of endocing spacing of dots (braille)

A

merkels and meissners bc good as detecting texture

62
Q

Can pancinaian determine spacing of dots well

A

no

63
Q

overall pic in brain d/t sum of info from pattern of actviation of dif fibers

A

spatial summation code

64
Q

thermoreceptors and nocireceptors have what type of nerve endins

A

free nerve endings

65
Q

encodes skin temp for warming and coling

A

thermoreceptors

66
Q

fire AP at continous slow rate at normal skin temp

A

Thermoreceptors

67
Q

Cooling receptors _______ rate when skin is cooled

A

increase

68
Q

When skin is warmed, cooling receptors

A

stop firing

69
Q

Type of nerve ending for cool receptors

A

free nerve ending, thinly myelinated (A-delta)

70
Q

Receptive field for cooling receptors

A

very small and infrequent

71
Q

When skin is warmed, warming receptores

A

increase firing rate

72
Q

when skin is cooled, warming receptors

A

stop firing

73
Q

Nerve ending of warming receptors

A

free nerve ending, unmyelated

74
Q

type of nerve for warming receptor

A

unmyleainate C fiber

75
Q

respond to stimuli that damage or threaten to damage tissue

A

nociceptors

76
Q

nociceptors make up

A

70% of all sensory neurons

77
Q

tooth pulp and cornea made up of

A

nociceptors

78
Q

A mechanoreceptosr are

A

nocireceptors

79
Q

these respond to intense force or heat

A

A mechanoreceptors

80
Q

A mechanoreceptor type is:

A

Adelta, axon unmyelinated and free nerve endins

81
Q

Nerve endins on A mecanoreceptors:
RF on A Mechanoreceptor
Slowly/quickly adapting

A

free
small RF
slowly adapting

82
Q

Fast pain: sharp, shooting, electrical pricking pain and easy to localize pain

A

A mechanonociceptors

83
Q

immediate pain when you stub toe, hit thumb, hand under hot waer

A

a mechanoreceptors

84
Q

If you get pinched, what type of adapting response do you get

A

slowly adapting with an on/off switch

85
Q

These guys sense intense force and high heat

A

C polymodal nociceptors

86
Q

C polymodal chemicals are:

A

bradykinin, prostaglandins and histamine

87
Q

Axon in C polymodal is myelinated/unmyelinated

A

unmylinated

88
Q

C polymodal nociceptors are slowly or rapidly adapting

A

slowly

89
Q

nociceptor for long-lasting, burning, aching pain thats hard to localize

A

C polymodal nociceptors

90
Q

pinch, zing, quick toe stub activates

A

A-mechanoreceptors

Med Neur 2 (12 decks)

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