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Neuroanatomy > Mechanoreception No.1 > Flashcards

Mechanoreception No.1 Flashcards

1
Q

what is mechanorception

A

detection of mechanical stimuli

with mechanoreceptors

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2
Q

what is adequate stimulus

A

pressure
vibration
tension

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3
Q

what is touch

A

sensory experience when mechanoreceptors are excited

involves CNS

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4
Q

what is exteroceptive

A

give information about things coming into contact with the body

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5
Q

what is proprioception

A

awareness of position

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6
Q

what is exteroceptors

A

muscosala nd skin receps

  • mehanoreceps
  • nociceptors
  • thermoreceps
  • chemoreceps

PDL Mechanoreceps

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7
Q

what are proprioceptors

A 
PDL mechanoreceps 
muscle spindles 
joint recess
golgi tendon organs 
inner ear
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8
Q

what do the mechanorecps of mucosa do

A

food texture- swallow food suitable

imp for mastication

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9
Q

what is function of PDL ligament mechanoreceps

A

forces of teeth

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10
Q

what are the mechanoreps in muscle

A

muscle spindles - monitor muscle length

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11
Q

what are mechanoreceps in joint recess useful for

A

joint position and movement

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12
Q

what sit he effect of stimulation of mechanorecps

A

sensation of touch
reflexes - jaw jerk, salivary reflexes
interact other sensory modalities - rubbing

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13
Q

what is the theory of vibraject

A

vibrating to activate the mechanorecps with vibration at same place of place activating nociceptors therefore trying to gate close and inhibit 3pain path

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14
Q

types of mechanoreceptorrs

A

physioloial classification
- aaptative properties -receptive field size

anatomical classification

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15
Q

what is rapidly adopting

A

AP force fires and then stops and adapts to force and maybe fires again when force goes off respond to changing states

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16
Q

what si slow adapting

A

apply same force and some receptors fire ad detect AP’s thro whole duration doesn’t adapt or very slow adapts

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17
Q

what are the four types of mechanoreceps

A

RA I
RA II
SA I
SA II

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18
Q

what is a receptive field

A

the area where a stimulus will affect the receptor covered by one receptor

19
Q

what are the properties of RA I

A

small receptive field and rapid adaptation

20
Q

what are the properties of RA II

A

large receptive field and rapid adaptation

21
Q

what are the properties of SA I

A

small receptive field and slow adaptation

22
Q

what are the properties of SA II

A

large receptive field and slow adaptation

23
Q

what are some mechanoreceptors

A

meissners corpuscle
pacianian corpuscle
merkel cells
Ruffini ending

24
Q

what are some RA I receptors

A

preset in

  • oral mucosa
  • vermillion border
  • mucosa of lip
  • hard palate
25
Q

what are some RA II receptors

A

pacinian corpuscles
depp in mucosa
rare in oral mucosa

26
Q

what are some SA I receptors

A

present in

  • tongue
  • lips
  • cheeks
27
Q

what ar some SA II Receptors

A

ruffini endings

PDL

28
Q

what is transduction

A

mechanical to electrical energy

causes deep to AP

29
Q

what is a parent axon

A

type nerve carry info

A- beta large myelinated fibres- fast

30
Q

what are touch thresholds

A

lips and oral mucosa - 10 mg
teeth 0.01N

sense of being touched

31
Q

what is 2 point discrimination tests

A

experiment ot see resolution touch diff parts of body

how close two blunts point can be to distinguish two points

32
Q

what are the 2 point discrimination thresholds fro tip tongue and lips

A

low 2 point threshold
tip tongue 1mm
centre lip

high innervation density
small receptive field

33
Q

what are the 2 point discrimination thresholds for fingertips

A

low 2 point thresholds

able to discriminate small objects

34
Q

what are the PDLM’s

A 
periodontal ligament mechanorceep 
imp sensory 
exteroceptive role (tp tooth)
proprioceptive role (chewing not aware of forces)
35
Q

what are the nerve endings of PDLM

A

ruffini nerve endings

36
Q

what are the affreents for PDLM’s

A

A beta axons

approx 300 per tooth

37
Q

what are the cell bodies in PDLM’s

A

V ganglion

mesencephalic nucleus - proprioception

38
Q

what studies PDLM in animals

A

cat canine prep
localise indie receps
single fibre recordings

39
Q

what studies PDLM in humans

A

recordings from IAN

discrete forces applied to teeth

40
Q

what are PDLM properties

A

no branched axons between adjacent teeth PDLs easy to localise
innervation density higher at apex

41
Q

what is the adequate stimulus for PDLM

A

tension in PDL due to pressure applied to tooth

tooth moves around in fulcrum

42
Q

what does the amount of PDLM activity dept on

A 
direction of applied force 
magnitude force
adaptation props
threshold of receps
position of receps in PDL
43
Q

why are there differences in PDLM’s

A

linked to position relative to fulcrum

smaller stimulus nearer the fulcrum

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