structure and function of peripheral sensory receptors Flashcards by Meghan May

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

PNS

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sensory pathways go up in ______ tracts

myleinated

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Sensory neurons of PNS had their cell bodies in

DRG

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Neurons of somatorsentory innervate where

neck and below

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type of cell boy of DRG

pseudounipolar

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Mechanoreceptors, thermoreceptors, nocireceptors are what type of sensory receptor

Exteroreceptive

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Proprireceptirve sensory receptors deal with

muscle lenght, tension

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Visceral afferents that localize pain and sensation poorly are part of

Interoreceptive category

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Area in periphery where an adequte stim cauases a respone

receptive field

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How does Pancinian corpuscle work

detects vibration–> activate ion chans–>generates AP

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frequency of action potential firing per neuron

Rate code

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

Spatial summation Code

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Action potential speed

conduction velociy

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A-alpha and A beta are

large myleinated finbers

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Abetta fibers for

skin: light touch, vibration, pressure

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Thin myelinated fiber A delta have____ ocnduction

medium conduction

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Fast pain cooling receptors (nocirecpetors) are

A delta fibers

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Unmyelinated C fibers are

slow

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nocireceptors (slow pain); warm recpetors are

unmyelinated C fibers

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Compound Action potential is clinical diagnostic tool for

recordig whole peripheral nerve

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Compound AP potential tool determines

is axon is missing, damaged or demyelinated

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to things that determine sensitivity and function of skin nerve endinds

location: superfiical or deep

ending; capsulated or non-capsulated

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sustained unchanging stimulus , from pressure or shapes of objects

Slowly adapting

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

Rapidly adapting

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what does spatial resolution depend on

Receptive field size of each neuron and innervation density

sensitive areas are usually:

high density of receptors | small size recepive fields

mechanoreceptors have ____ threshold ______respond to pain ________ unless stimulated

low don't silent

These guys are great for fine touch, 2 pt discrimination

Merkels disk

how are merkels discs innervated

1 axon per several disks

Merkel discs are _______ adapting response

slowly

what is the receptive field for merkels disc

several, small sensitive touch domes

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

merkel discs

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

merkels discs

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

Meissners corpuscles

these are in glabrous skin only

meissners corpuslces

what is the receptive field for meissners corpuslces

single spot

Meisnners corpuscles found in high densitiy in:

finger tips, lips and mouth

These guys enclose stacks of schwann cells

meissners corpuscles

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

Meissners corpuscles (superficial)

merkels disk are superficial or deep

superficial

the receptive field for meissners corpuslcles

single spot

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

times skin indented

Meissners are slow or rapid adapting

rapid

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

Ruffiini corpuscles

ruffini corpuslces located

deep in dermis

Receptive filed for Ruffini corpuscles are

large and diffuse

stretch of skin sensed by

ruffini corpuscles

good for sense of gravity force against skin

ruffinnii corpuslces

what's the receptive field like for ruffinni corpuscles

large and diffuse

Ruffinni corpuslces axons do this

surround collagen fibils

Ruffini use what type of fiber

Abetta slow adaptors

this stretches skin and dertermines what you graspoed

ruffinni

pancinian corpuscles are superficial or deep

deep

extremely sensitive, good at detectin high frequency

panciana corpuscles

receptive field for pancian corpuslces

very large and diffuse

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

pancinian

pancianan is rapid/slow adapting

rapid

Receptive field has axons wrapped around base of follicle

hair follcle receptor

Hair follicle receptors are rapid or slow adaptigin

rapid

Hair fibers can be

Abetta or A gamma

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

merkels and meissners bc good as detecting texture

Can pancinaian determine spacing of dots well

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

spatial summation code

thermoreceptors and nocireceptors have what type of nerve endins

free nerve endings

encodes skin temp for warming and coling

thermoreceptors

fire AP at continous slow rate at normal skin temp

Thermoreceptors

Cooling receptors _______ rate when skin is cooled

increase

When skin is warmed, cooling receptors

stop firing

Type of nerve ending for cool receptors

free nerve ending, thinly myelinated (A-delta)

Receptive field for cooling receptors

very small and infrequent

When skin is warmed, warming receptores

increase firing rate

when skin is cooled, warming receptors

stop firing

Nerve ending of warming receptors

free nerve ending, unmyelated

type of nerve for warming receptor

unmyleainate C fiber

respond to stimuli that damage or threaten to damage tissue

nociceptors

nociceptors make up

70% of all sensory neurons

tooth pulp and cornea made up of

nociceptors

A mechanoreceptosr are

nocireceptors

these respond to intense force or heat

A mechanoreceptors

A mechanoreceptor type is:

Adelta, axon unmyelinated and free nerve endins

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

free small RF slowly adapting

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

A mechanonociceptors

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

a mechanoreceptors

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

slowly adapting with an on/off switch

These guys sense intense force and high heat

C polymodal nociceptors

C polymodal chemicals are:

bradykinin, prostaglandins and histamine

Axon in C polymodal is myelinated/unmyelinated

unmylinated

C polymodal nociceptors are slowly or rapidly adapting

slowly

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

C polymodal nociceptors

pinch, zing, quick toe stub activates

A-mechanoreceptors

structure and function of peripheral sensory receptors Flashcards

(90 cards)