N13- Thermoreception Flashcards
What is thermoreception?
Detection of non-noxious temperature changes
what is a result of thermoreception?
- sensory- warm and cold sensation
- non-sensory-reflexes
where are thermorecepters well developed?
In mouth-especially the front
what is thermoreception an important component for?
flavour experience
Describe the sensation of hot and cold.
- Respond to temperature changes of <1oC
- Especially in the range: 29oC-39oC
what temperature is thermorecption bias to?
Cold bias:
-5-10x more cold spots than hot spots
what can you do to check tooth viability?
blow air on tooth
How do we cope with extreme temperatures in the mouth?
- Blood flow – heat exchanger – air going into lungs is heated so lunch alveoli do not freeze
- Ducks – body temp maintained as arterial blood heats venous blood goin g back to body
what are similarities of thermoreception and nociception?
Peripheral nerves
- free nerve endings
- Ad and C fibres
what is different about thermorecption and nociception?
Thermorecption- central pathways- 1st synapse in V nucleus caudal(or spinal dorsal horn) and minimal modification at the first synapse
Nociception- central pathway-1st synapse in V nucleus caudalis +/- oralis (or spinal dorsal horn)- Significant modification at the first synapse
what fibres detect rapid change in temp?
Ad fibres
what fibres detect long term change of cooling/warming?
C fibres
what are static properties of thermoreceptors?
Steady firing with constant temperature
what are the dynamic properties of thermorecption?
Warm receptor: Warming – increase frequency of AP Cooling - transient inhibition Cold receptor: Warming– transientinhibition Cooling – increase frequency of AP
Describe transduction in themroreception.
Temperature causes membrane permeability change – receptor
