Mechanoreception No.1 Flashcards Preview

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Flashcards in Mechanoreception No.1 Deck (43)
1

what is mechanorception

detection of mechanical stimuli
with mechanoreceptors

2

what is adequate stimulus

pressure
vibration
tension

3

what is touch

sensory experience when mechanoreceptors are excited
involves CNS

4

what is exteroceptive

give information about things coming into contact with the body

5

what is proprioception

awareness of position

6

what is exteroceptors

muscosala nd skin receps
- mehanoreceps
-nociceptors
-thermoreceps
- chemoreceps

PDL Mechanoreceps

7

what are proprioceptors

PDL mechanoreceps
muscle spindles
joint recess
golgi tendon organs
inner ear

8

what do the mechanorecps of mucosa do

food texture- swallow food suitable
imp for mastication

9

what is function of PDL ligament mechanoreceps

forces of teeth

10

what are the mechanoreps in muscle

muscle spindles - monitor muscle length

11

what are mechanoreceps in joint recess useful for

joint position and movement

12

what sit he effect of stimulation of mechanorecps

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

13

what is the theory of vibraject

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

14

types of mechanoreceptorrs

physioloial classification
- aaptative properties -receptive field size

anatomical classification

15

what is rapidly adopting

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

16

what si slow adapting

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

17

what are the four types of mechanoreceps

RA I
RA II
SA I
SA II

18

what is a receptive field

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

19

what are the properties of RA I

small receptive field and rapid adaptation

20

what are the properties of RA II

large receptive field and rapid adaptation

21

what are the properties of SA I

small receptive field and slow adaptation

22

what are the properties of SA II

large receptive field and slow adaptation

23

what are some mechanoreceptors

meissners corpuscle
pacianian corpuscle
merkel cells
Ruffini ending

24

what are some RA I receptors

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