Mechanoreception No.1 Flashcards

(43 cards)

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
what are some RA II receptors
pacinian corpuscles depp in mucosa rare in oral mucosa
26
what are some SA I receptors
present in - tongue - lips - cheeks
27
what ar some SA II Receptors
ruffini endings | PDL
28
what is transduction
mechanical to electrical energy | causes deep to AP
29
what is a parent axon
type nerve carry info | A- beta large myelinated fibres- fast
30
what are touch thresholds
lips and oral mucosa - 10 mg teeth 0.01N sense of being touched
31
what is 2 point discrimination tests
experiment ot see resolution touch diff parts of body | how close two blunts point can be to distinguish two points
32
what are the 2 point discrimination thresholds fro tip tongue and lips
low 2 point threshold tip tongue 1mm centre lip high innervation density small receptive field
33
what are the 2 point discrimination thresholds for fingertips
low 2 point thresholds | able to discriminate small objects
34
what are the PDLM's
``` periodontal ligament mechanorceep imp sensory exteroceptive role (tp tooth) proprioceptive role (chewing not aware of forces) ```
35
what are the nerve endings of PDLM
ruffini nerve endings
36
what are the affreents for PDLM's
A beta axons | approx 300 per tooth
37
what are the cell bodies in PDLM's
V ganglion | mesencephalic nucleus - proprioception
38
what studies PDLM in animals
cat canine prep localise indie receps single fibre recordings
39
what studies PDLM in humans
recordings from IAN | discrete forces applied to teeth
40
what are PDLM properties
no branched axons between adjacent teeth PDLs easy to localise innervation density higher at apex
41
what is the adequate stimulus for PDLM
tension in PDL due to pressure applied to tooth | tooth moves around in fulcrum
42
what does the amount of PDLM activity dept on
``` direction of applied force magnitude force adaptation props threshold of receps position of receps in PDL ```
43
why are there differences in PDLM's
linked to position relative to fulcrum smaller stimulus nearer the fulcrum