Occlusion L6/L7 - Mechanoreception and Proprioception

Question 1

Detection of a mechanical stimuli through a peripheral receptor is called.

Answer 1

Mechanoreceptor

Question 2

Which type of reception gives us information about how things coming into contact with the body?

Answer 2

Exteroception

Question 3

Which type of reception gives us information about our self, such as awareness of position?

Answer 3

Proprioception

Question 4

What is a receptive field?

Answer 4

The area/space where a stimulus will affect the receptor.

Question 5

Ruffini nerve endings are best found where in the oral cavity.

Answer 5

Nerve endings for periodontal ligaments mechanoreceptors are Ruffini.

Question 6

Are the periodontal ligament mechanoreceptors afferent or efferent?

Answer 6

Afferent, Alpha beta axons

Question 7

Where do the cell bodies of the periodontal ligament mechanoreceptors reside to?

Answer 7

V ganglion, then to the mesencephalic nucleus

Question 8

Innervation density is at its highest, in which region of the periodontal ligament

Answer 8

Higher at apex

Question 9

Tooth must move around a what? to detect adequate stimulus?

Answer 9

Fulcrum

Question 10

Which region of the tooth would you expect to find slowly adapting, low threshold mechanoreceptors?

Answer 10

Apically

Question 11

Which region of the tooth would you expect to find rapidly adapting, high threshold mechanoreceptors?

Answer 11

Cervically

Question 12

How many stages are there to a sensory pathway?

Answer 12

4 stages

Question 13

During stage 1 the mechanoreceptors have been stimulated and propagation along primary afferent nerve, what happens next?

Answer 13

They are processed at the first synapse at the trigeminal nuclei.

Question 14

After a sensory stimulus has been processed at the trigeminal nuclei what happens next?

Answer 14

It is processed in the thalamus.

Question 15

At what stage does the sensory stimulus leave the peripheral nervous system and enter the central nervous system?

Answer 15

During stage 2, at its first synapse.

Question 16

After the stimulus has been processed at the thalamus what happens next? It is processed in the

Answer 16

cerebral cortex for conscious perception.

Question 17

What is proprioception?

Answer 17

A feedback system that allows us to be aware of our own movement

Question 18

What are the three receptors involved in proprioception?

Answer 18

Muscle spindles

Golgi tendon organs

Joint receptors

Question 19

What are extrafusal muscle?

Answer 19

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.

Question 20

What are intrafusal muscle fibres?

Answer 20

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

Question 21

Afferent nerves are activated by what?

Answer 21

Stretch

Question 22

Where are the masticatory muscle spindles cell bodies located?

Answer 22

Trigeminal mesencephalic nucleus

Question 23

Were do muscle spindle afferents synapse?

Answer 23

V motor nucleus

Question 24

What happens when the muscle shortens?

Answer 24

Muscle contracted – shortens.

Question 25

Gamma (y) motor neurones cause contraction of which muscle fibres?

Answer 25

Intrafusal fibres

Question 26

What is the purpose of gamma motor neurones?

Answer 26

Maintain tension in spindle and maintain spindle afferent activity

Question 27

Pacinian, Golgi and Ruffini are example of receptors located where?

Answer 27

Joint receptors