Trigeminal Proprioception Flashcards

1
Q

what is proprioception

A

awareness of position of body parts in relation to each other and surroundings

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2
Q

what is kinaesthesia

A

movement awareness

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3
Q

what are the receptors involved in proprioception

A

muscle spindles
golgi tendon organs
joint receptors
- also stretch receptors in skin

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4
Q

what does principal jaw closing muscles have

A

muscle spindles

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5
Q

do jaw open muscles have muscle spindles

A

no

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6
Q

what is designed to put force through teeth

A

jaw closing muscles

PDL mechanoreceptors

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7
Q

what is special about the TMJ

A

has range of receptors give information how open and how close and speed doing so of the jaw

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8
Q

what do inner ear receptors contribute

A

perceive head position

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9
Q

what are the two types of muscle fibres

A

extrafusla and intrafusal

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10
Q

what are extrafusal fibres

A

bulk of muscle fibres
contractile
generate force and movement

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11
Q

what are intrafusal fibres

A

muscle spindles
specialised muscle fibres
within a ct capsule

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12
Q

what are the there zones of an intrafusla fibre

A

2 contractile end portions

non contractile central portion can be stretched

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13
Q

what are the afferents of the intrafusal fibre activated by

A

stretch

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14
Q

what are the secondary nerve endings in the intrafusal fibre

A

detects length of fibres slowly adapting

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15
Q

what is the primary annulo-spira nerve endings

A

detects length of fibres and speed of change of length

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16
Q

what is the efferent in intrafusal fibres

A

gamma motor neurone

ake contraction

17
Q

what fibres supply the extrafusal fibres

A

alpha motor neurones

18
Q

what is significant about alpha motor neurones

A

fastest afferents in the body

19
Q

how can you record muscle spindle activity

A

oscilloscope

20
Q

what is seen by a muscle fibre at rest

A

spindle afferent at rest see AP’s fire at set rate

21
Q

what happens to muscle fibres firing when stretched

A

the more stretched the more firing

22
Q

what are the main roles of muscle spindle fibres

A

info about muscle length

act to maintain muscle length

23
Q

what is the thought process behind jerk reflexes

A

muscle spindle afferents synapse with alpha motorneuorens increase stretch muscle increases firing which causes contraction
feedback loops synchronised muscle stretch

24
Q

what is an example of muscle spindles in action

A

bucket fills with water
biceps spindles stretch
increased moo neurone drive to biceps
muscle length maintained

25
Q

where are masticatory muscle spindles

A

in cell bodies in trigeiminla mesencehlaic nucleus in CNS don’t synapse here

26
Q

where do muscle spindle afferents synapse for masticatory muscles

A

v motor nucleus

and cerebellum and cerebral cortex

27
Q

what happens when muscle shortens

A

when shortens signal t alpha send a gamma also cause intrafusal to contract to keep it tense and therefore responsive

28
Q

what do gamma motor neurones do

A

contraction of intrafusal fibres
maintain tension in spinde
maintain spindle afferent activity
alpha-gamma co activation

29
Q

what is another muscle spindle role and what is analogy

A

load compensation

– carrot analogy

30
Q

what are golgi tendon organs

A

series with muscle fibres in tendons
non in mast muscles
tension receptors
role in inhibit reflex

31
Q

what are the joint receptors

A

pacinian - ligaments - acceleration
golgi - ligament - position
ruffini - capsule - movement

32
Q

what is interdental detection

A

can detect 50 microns between teeth

33
Q

what are the receptors for interdental detection

A

PDLM’s
muscle spindles
maybe joint receptors

34
Q

what si the jaw repining test

A

ability to reposition jaw

accuracy of order <2mm

35
Q

what are the receptors for jaw repositioning test

A

muscle spindles
TMJ
not PDLM’s as no tooth contact