control of mastication Flashcards

1
Q

what are chewing cycles controlled by?

A

jaw movements

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what is food directing controlled by?

A

cheek movements

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

what is the role of tongue movements?

A

directing food, crushing food, mixing food, and saliva

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what is the role of lip movements?

A

(accepting food), retaining food (anterior oral seal), directing food

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what type of movement is jaw opening?

A

hinge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what type of movement is wide jaw opening?

A

hinge and slide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what movement is protrusion?

A

slide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what side is bennett movement?

A

working side

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what side is the bennett angle?

A

non working side

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what does the condyle do on the working side?

A

rotates around the vertical axis
lateral bodily movement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what does the condyle do on the non-working side?

A

moves downwards
forwards over eminence
moves medially

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

how long does the chewing cycle last?

A

0.5-1.2 seconds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what are the stages of the chewing cycle?

A

opening
fast closing
slow closing
intercuspal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what is the sequence of muscle activation upon opening?

A

mylohyoid
digastric
lateral pterygoid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what is the muscle activation sequence upon closing?

A

temporalis
masseter
medial pterygoid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what force can be produces upon mastication?

17
Q

what force can be produced between molars when biting?

18
Q

What are the levels of control?

A

reflex
pattern generator
voluntary

19
Q

what is mastication controlled by?

A

motor nucleus

20
Q

what are chewing patterns controlled by?

A

chewing centre

21
Q

what does the higher centre controlled?

A

stop and start chewing

22
Q

during control of mastication, what works alongside the centres?

23
Q

what is a reflex?

A

predictable response to a given stimulus

usually mono-synaptic

24
Q

what are types of stretch reflexes?

A

tonic
phasic

25
what is the role of tonic stretch reflexes?
resist gravity maintain jaw posture
26
what is the role of phasic stretch reflexes?
load compensation during chewing stabilises jaw during vigorous head movements - running
27
what do protective reflexes respond to?
noxious stimulus
28
what stimulates jaw "opening" reflexes?
intra-oral mechanical/ noxious extra-oral noxious
29
what is humans response to inhibitory jaw reflexes?
inactivation of jaw closing muscles
30
what is the role of inhibitory jaw reflexes?
- prevent overloading - facilitate opening
31
what stimulates jaw unloading reflexes?
sudden closure following hard biting
32
what is the response to jaw unloading reflexes?
inactivation of jaw closing materials activation of jaw opening muscles
33
what is the result of jaw unloading reflexes?
teeth dont crash together