W19-L7: Peripheral sensory mechanisms Flashcards
What is glabrous skin?
hairless skin
How do pancinian receptors detect vibration?
Physical opening of Na channels
Slowly adapting receptors
Tells you how much stimulus is still being applied, continues to signal as long as stimulus is present
Rapidly adapting receptors
Tells you about change, signals when stimulus is present and again once its removed
Where does a mechanoreceptor signal to?
Two signals, local in the spinal cord and ascending
What has a higher threshold tactile or nociceptors?
Nociceptors have a higher threshold
What do nociceptors signal?
Tells us about changes in the internal environment as a result of a damaging insult
Pacinian receptors
Sensitive to vibrations, low density, rapidly adapting and deep, large receptor field
Meissner receptors
Sensitive to light touch, high density, rapidly adapting and superficial, small receptor fields
Merkel receptors
Sensitive to pressure, high density, slowly adapting and superficial, small receptor fields
Ruffini receptors
Sensitive to stretch, low density, slowly adapting and deep, medium sized receptor field
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
Receptor Field
Measure of how much territory a single receptor responds to
What is the axon type for proprioceptors?
Type Ia, II
What is the axon type for merker, messiner, pacinian and ruffini cells?
Aß
