Occlusion L8 - Control of mastication Flashcards
How long does the chewing cycle take place?
0.5 – 1.2 secs
What occurs during the chewing cycle?
Opening
Fast closing
Slow closing
Intercuspal phases
Would there be greater or lesser lateral movements during the chewing cycle if the food was brittle?
Lesser lateral movements
Would there be greater or lesser lateral movements during the chewing cycle if the food was tougher?
Greater lateral movements
The sequence of muscle activation in the chewing cycle for opening is?
Mylohyoid > digastric > Lateral pterygoid
The sequence of muscle activation in the chewing cycle for closing is?
Temporalis > Masseter > Medial pterygoid (Lateral pterygoid also active)
Why is jaw reflex important?
We may bite our tongue and the jaw reflex will help prevent us from ripping off the tongue.
Which centre sends a pattern of codes to the motor nucleus which activates specific nerves in a specific pattern which drives the masticatory movement?
Chewing centre
Which centre allows us to voluntarily control chewing pattern, through the motor nucleus?
Higher centres
What is a reflex?
A predictable response to a given stimulus
What are the three type of reflexes?
Stretch reflex
Protective reflex
Unloading reflex – jaw
Which reflex system is the simplest form?
Stretch reflexes
Why are stretch reflex the simplest form?
Because it usually is mono-synaptic, meaning it has to synapse once.
A knee jerk reflex is an example of what type of reflex?
Stretch reflex
What is reflex latency?
It is the time taken from the stimulus to the effector. That is usually the length of the pathway.
