W19-L7: Peripheral sensory mechanisms Flashcards Preview

Matt's Block 06 - Neuro block > W19-L7: Peripheral sensory mechanisms > Flashcards

Flashcards in W19-L7: Peripheral sensory mechanisms Deck (17):
1

What is glabrous skin?

hairless skin

2

How do pancinian receptors detect vibration?

Physical opening of Na channels

3

Slowly adapting receptors

Tells you how much stimulus is still being applied, continues to signal as long as stimulus is present

4

Rapidly adapting receptors

Tells you about change, signals when stimulus is present and again once its removed

5

Where does a mechanoreceptor signal to?

Two signals, local in the spinal cord and ascending

6

What has a higher threshold tactile or nociceptors?

Nociceptors have a higher threshold

7

What do nociceptors signal?

Tells us about changes in the internal environment as a result of a damaging insult

8

Pacinian receptors

Sensitive to vibrations, low density, rapidly adapting and deep, large receptor field

9

Meissner receptors

Sensitive to light touch, high density, rapidly adapting and superficial, small receptor fields

10

Merkel receptors

Sensitive to pressure, high density, slowly adapting and superficial, small receptor fields

11

Ruffini receptors

Sensitive to stretch, low density, slowly adapting and deep, medium sized receptor field

12

In a simple manipulation task what does each receptor encode?

• Meissner encode rate of force.
• Merkel encode grip force.
• Pacinian encode vibrations.
• Ruffini encode hand posture

13

Receptor Field

Measure of how much territory a single receptor responds to

14

What is the axon type for proprioceptors?

Type Ia, II

15

What is the axon type for merker, messiner, pacinian and ruffini cells?

16

What is the axon type for free nerve endings?

A delta or C fibres

17

Where do the nociceptors synapse and where do they ascend?

Synapse at the level of entry into the spinal cord and then ascend contralaterally

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