Occlusion L6/L7 - Mechanoreception and Proprioception Flashcards
Detection of a mechanical stimuli through a peripheral receptor is called.
Mechanoreceptor
Which type of reception gives us information about how things coming into contact with the body?
Exteroception
Which type of reception gives us information about our self, such as awareness of position?
Proprioception
What is a receptive field?
The area/space where a stimulus will affect the receptor.
Ruffini nerve endings are best found where in the oral cavity.
Nerve endings for periodontal ligaments mechanoreceptors are Ruffini.
Are the periodontal ligament mechanoreceptors afferent or efferent?
Afferent, Alpha beta axons
Where do the cell bodies of the periodontal ligament mechanoreceptors reside to?
V ganglion, then to the mesencephalic nucleus
Innervation density is at its highest, in which region of the periodontal ligament
Higher at apex
Tooth must move around a what? to detect adequate stimulus?
Fulcrum
Which region of the tooth would you expect to find slowly adapting, low threshold mechanoreceptors?
Apically
Which region of the tooth would you expect to find rapidly adapting, high threshold mechanoreceptors?
Cervically
How many stages are there to a sensory pathway?
4 stages
During stage 1 the mechanoreceptors have been stimulated and propagation along primary afferent nerve, what happens next?
They are processed at the first synapse at the trigeminal nuclei.
After a sensory stimulus has been processed at the trigeminal nuclei what happens next?
It is processed in the thalamus.
At what stage does the sensory stimulus leave the peripheral nervous system and enter the central nervous system?
During stage 2, at its first synapse.
After the stimulus has been processed at the thalamus what happens next? It is processed in the
cerebral cortex for conscious perception.
What is proprioception?
A feedback system that allows us to be aware of our own movement
What are the three receptors involved in proprioception?
Muscle spindles
Golgi tendon organs
Joint receptors
What are extrafusal muscle?
Extrafusal muscle fibres are the skeletal standard muscle fibres that are innervated by alpha motor neurons and generate tension by contracting, thereby allowing for skeletal movement.
What are intrafusal muscle fibres?
Intrafusal muscle fibres are skeletal muscle fibres that serve as specialized sensory organs (proprioceptors) that detect the amount and rate of change in length of a muscle
Afferent nerves are activated by what?
Stretch
Where are the masticatory muscle spindles cell bodies located?
Trigeminal mesencephalic nucleus
Were do muscle spindle afferents synapse?
V motor nucleus
What happens when the muscle shortens?
Muscle contracted – shortens.
