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4 Mastication and Occlusion > Mechanoreception > Flashcards

Mechanoreception Flashcards

1
Q

what is mechanoreception?

A

the detection of mechanical stimuli (pressure, vibration, tension) by mechanoreceptors through distortion.

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2
Q

what is exteroception?

A

gives information about things coming into contact with the body

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3
Q

what is proprioception?

A

knowing where parts of the body are (subconscious)

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4
Q

what is touch?

A

the sensory experience when mechanoreceptors are excited (CNS)

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5
Q

Physiological classification of mechanoreceptors

describe rapidly adapting mechanoreceptors, what do they tell u?

A

only fires when force is changing (increase/decrease in pressure)

How fast applying the force

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6
Q

physiological classification of mechanoreceptors

describe slow adapting mechanoreceptors, what do they tell u?

A

receptor fires whole time force is applied
Magnitude of the force

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7
Q
A
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8
Q

what is receptive field?

A

amount of tissue that is governed by one nerve

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9
Q

a smaller receptive field means what?

A

more detailed information (e.g. fingertips)

better 2-point discrimination

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10
Q

what classifications is a RA I mechanoreceptor?

A

rapid adapting
small receptive field

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11
Q

what classifications is a RA II mechanoreceptor?

A

rapid adapting
large receptive field

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12
Q

what classification is SA I mechanoreceptor?

A

slow adapting
small receptive field

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13
Q

what classification is SA II mechanoreceptor?

A

slow adapting
large receptive field

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14
Q

what anatomical classification of mechanoreceptor is this?

A

meissner’s corpuscle

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15
Q

what anatomical classification of mechanoreceptor is this?

A

pacinian corpuscle

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16
Q

what anatomical classification of mechanoreceptor is this?

A

merkel cells

17
Q

what anatomical classification of mechanoreceptor is this?

A

ruffini ending

18
Q

what Physiological classification of mechanoreceptor is meissner’s corpuscle?

A

RA I

19
Q

what Physiological classification of mechanoreceptor is ruffini ending?

A

SA II

20
Q

what Physiological classification of mechanoreceptor is merkel cells?

A

SA I

21
Q

what Physiological classification of mechanoreceptor is pacinian corpuscle?

A

RA II

22
Q

what is 2 point discrimination test?

A
  • How far apart does it need to be to feel it as two separate points
    • Reflects innervation density and receptive field size
      Fingertip is very discriminative due to high innervation density and small receptive field
23
Q

2 point discrimination test

A
24
Q

what nerve endings are PDL mechanoreceptors (PDLMs)?

A

Ruffini endings SA II

25
Q

quick revision

A
26
Q

what afferents do PDLMs have?

A

Ab axons

27
Q

where are the cell bodies for PDLMs?

A

V ganglion
Mesencephalic nucleus - group of primary afferent cell bodies in the CNS

28
Q

where are the synapses for PDLMs?

A

Main sensory nucleus
V nucleus

29
Q

sensory pathway of PLDMs

A
30
Q

are there branched axons from PDLMs?

A

no, nerves only supply the PDL of one tooth -> easy to localise

31
Q

the innervation density of PDLMs is higher where?

A

apex

32
Q

what is the stimulus for PDLMs?

A

tension

33
Q

what is the physiological classification of PDLMs apically? why?

A

slow adapting

low threshold to activate it

Smaller stimulus apically compared to cervically

34
Q

what is the phsyiological classification of PDLMs cervically? why?

A

fast adapting

high threshold

requires higher force to activate it

35
Q

what is the function of PDLMs?

A

fine motor control

36
Q

what is surround inhibition?

A

presynaptic inhibition -> sharpens touch perception

Inhibits the smaller signals from around the stimulus, enhancing the contrast, to give exact location

occurs during processing at the first synapse: V ganglion and mesencephalic nucleus

37
Q

what is the sensory pathway for PDLMs?

A

mechanoreception
processing at first synapse
processing in thalamus
conscious perception - somatosensory cortex

38
Q
A

4 Mastication and Occlusion (7 decks)

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