Mechanoreception No.1

Question 1

what is mechanorception

Answer 1

detection of mechanical stimuli

with mechanoreceptors

Question 2

what is adequate stimulus

Answer 2

pressure
vibration
tension

Question 3

what is touch

Answer 3

sensory experience when mechanoreceptors are excited

involves CNS

Question 4

what is exteroceptive

Answer 4

give information about things coming into contact with the body

Question 5

what is proprioception

Answer 5

awareness of position

Question 6

what is exteroceptors

Answer 6

muscosala nd skin receps

• mehanoreceps
• nociceptors
• thermoreceps
• chemoreceps

PDL Mechanoreceps

Question 7

what are proprioceptors

Answer 7

PDL mechanoreceps 
muscle spindles 
joint recess
golgi tendon organs 
inner ear

Question 8

what do the mechanorecps of mucosa do

Answer 8

food texture- swallow food suitable

imp for mastication

Question 9

what is function of PDL ligament mechanoreceps

Answer 9

forces of teeth

Question 10

what are the mechanoreps in muscle

Answer 10

muscle spindles - monitor muscle length

Question 11

what are mechanoreceps in joint recess useful for

Answer 11

joint position and movement

Question 12

what sit he effect of stimulation of mechanorecps

Answer 12

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

Question 13

what is the theory of vibraject

Answer 13

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

Question 14

types of mechanoreceptorrs

Answer 14

physioloial classification
- aaptative properties -receptive field size

anatomical classification

Question 15

what is rapidly adopting

Answer 15

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

Question 16

what si slow adapting

Answer 16

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

Question 17

what are the four types of mechanoreceps

Answer 17

RA I
RA II
SA I
SA II

Question 18

what is a receptive field

Answer 18

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

Question 19

what are the properties of RA I

Answer 19

small receptive field and rapid adaptation

Question 20

what are the properties of RA II

Answer 20

large receptive field and rapid adaptation

Question 21

what are the properties of SA I

Answer 21

small receptive field and slow adaptation

Question 22

what are the properties of SA II

Answer 22

large receptive field and slow adaptation

Question 23

what are some mechanoreceptors

Answer 23

meissners corpuscle
pacianian corpuscle
merkel cells
Ruffini ending

Question 24

what are some RA I receptors

Answer 24

preset in

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

Question 25

what are some RA II receptors

Answer 25

pacinian corpuscles depp in mucosa rare in oral mucosa

Question 26

what are some SA I receptors

Answer 26

present in - tongue - lips - cheeks

Question 27

what ar some SA II Receptors

Answer 27

ruffini endings | PDL

Question 28

what is transduction

Answer 28

mechanical to electrical energy | causes deep to AP

Question 29

what is a parent axon

Answer 29

type nerve carry info | A- beta large myelinated fibres- fast

Question 30

what are touch thresholds

Answer 30

lips and oral mucosa - 10 mg teeth 0.01N sense of being touched

Question 31

what is 2 point discrimination tests

Answer 31

experiment ot see resolution touch diff parts of body | how close two blunts point can be to distinguish two points

Question 32

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

Answer 32

low 2 point threshold tip tongue 1mm centre lip high innervation density small receptive field

Question 33

what are the 2 point discrimination thresholds for fingertips

Answer 33

low 2 point thresholds | able to discriminate small objects

Question 34

what are the PDLM's

Answer 34

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

Question 35

what are the nerve endings of PDLM

Answer 35

ruffini nerve endings

Question 36

what are the affreents for PDLM's

Answer 36

A beta axons | approx 300 per tooth

Question 37

what are the cell bodies in PDLM's

Answer 37

V ganglion | mesencephalic nucleus - proprioception

Question 38

what studies PDLM in animals

Answer 38

cat canine prep localise indie receps single fibre recordings

Question 39

what studies PDLM in humans

Answer 39

recordings from IAN | discrete forces applied to teeth

Question 40

what are PDLM properties

Answer 40

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

Question 41

what is the adequate stimulus for PDLM

Answer 41

tension in PDL due to pressure applied to tooth | tooth moves around in fulcrum

Question 42

what does the amount of PDLM activity dept on

Answer 42

``` direction of applied force magnitude force adaptation props threshold of receps position of receps in PDL ```

Question 43

why are there differences in PDLM's

Answer 43

linked to position relative to fulcrum smaller stimulus nearer the fulcrum