Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

BDS2.5 Neurophysiology > Neurophysiology - Jaw reflexes > Flashcards

Neurophysiology - Jaw reflexes Flashcards

1
Q

What is the definition of a reflex?

A

a predictable response to a given stimulus

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

Name the parts of the reflex arc

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

what is reflex latency?

A

time from stimulus to effect

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

Why is there a latency in reflex?

A

there is a conduction time of the afferent neurons

Synaptic delay

conduction time of efferent neurones

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

What is the conduction time of a small diameter afferent neurone?

A

smaller conduction time, smaller AP

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

What is the minimum synaptic delay per synapse?

A

0.2 ms per synapse

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are integrated actions?

A

walking, breathing, parts of swallowing

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

What are the 2 categories of jaw reflexes?

A

vertical

horizontal

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

What is the movement of a vertical jaw reflex?

A

move mandible relative to maxilla in vertical plane

jaw jerk
jaw opening
jaw unloading

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

What is the movement of a horizontal jaw reflex?

A

move mandible relative to maxilla in protrusive retrusive or lateral direction

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

What are the 3 vertical jaw reflexes?

A

jaw jerk
jaw opening
jaw unloading

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

What type of reflex is the jaw jerk reflex?

A

a phasic stretch reflex

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

What is the stuimulus odf the jaw jerk reflex?

A

sudden jaw opening

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

What is the response of the jaw jerk reflex?

A

activation of jaw closing muscles

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

How many synapses are involved in the jaw jerk reflex?

A

1

monosynaptic

17
Q

What is the synapse for the jaw jerk reflex between?

A

jaw closing muscles spindles and jaw closing motor neurons

18
Q

What is the latency in the jaw jerk reflex?

A

8ms

19
Q

What are the stages in the jaw jerk reflex?

A
  1. stimulus: stretch (via chin tap)
  2. receptor: muscle spindle
  3. synapse(s): 1 in V motor nucleus
  4. effect: contraction of masseter muscle

latency: 8ms

20
Q
A
  1. trigeminal mesencephalic nucleus
  2. trigeminal motor nucleus
21
Q

How do you record AP from muscles?

A

electromyography

22
Q

What is the role of the jaw jerk reflex in the phasic situation?

A

plays a role in load compensation during chewing –> e.g. biting something hard and you need more force, muscle spindles are stretched and the force of the bite is stronger

stabilization during vigorous head movements - e.g. during running

23
Q

What is the role of jaw jerk reflex in the tonic situation?

A

resist gravity

help maintain posture? … e.g. rest position of the mandible

24
Q

What is the rest position of the mandible?

A

teeth apart at rest

25
Q

How is the rest/postural position of the mandible maintained?

A

minimal muscle activity or governed by muscle elasticity

active (stretch reflex) or passive (tissue elasticty)

BDS2.5 Neurophysiology (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions