Peripheral sensory mechanisms Flashcards Preview

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Flashcards in Peripheral sensory mechanisms Deck (23):
1

what is glabrous skin? where is it found?

hairless: hands and feet with skin ridges

2

which corpuscles are close to surface?

Meissner corpuscles
Merkel complex

3

which corpuscles are deeper?

pascinian
Ruffini

4

Mechanoreceptors are?

the 4 corpuscles help to experience touch

5

how does transduction in a mechanosensory afferent work?

the ion channels are opened if threshold is reached via mechanical force eg. pascinian corpuscles and vibration

6

difference between slowly and rapidly adapting mechanoreceptors?

rapid: get used to stim easily and stops firing
slow: keeps firing, you're aware after continued stim

7

tactile vs. nociceptive thresholds?

tactile: low threshold
nociceptor: high threshold/wide range

8

Which corpuscles have large vs. small receptor fields

large: pascinian, ruffini
small: meissner, merkel

9

Which corpuscles are slowly adapting?

merkel
ruffini

10

Which corpuscles are rapid adapting?

meissner
pascinian

11

Ruffini detect what?

proprioceptive

12

Pascinian detect?

vibrations

13

Merkel

indentation

14

Meisner detect?

light touch

15

which corpuscles has smallest receptor fields?

merkel

16

gripping an object: what do each of the 4 mechanoreceptors do?

Meissner encode rate of force
Merkel encodes grip
pacinian: vibration
Ruffini: hand posture

17

two point discrimination tests?

closeness of receptor fields

18

which nerves are smallest? slowest? why?

nociceptor: free nerve endings, slow, so you can pack lots of them in densely

19

mechanoreceptors for touch are large or small? have myelin?

large myelinated

20

what innervated face dermatome?

trigeminal

21

dermatomes only in one band of skin?

lots of overlap
can spread to one dermatome on either side

22

how to tell dermatome vs. peripheral nerve?

dermatome affects the entire length usually because the problem is proximal

23

3 zones of trigeminal?

opthalmic
maxillary
mandibular