L-24 Flashcards
Name the 5 “special” senses
- vision
- hearing
- balance
- taste
- smell
How many somatic senses are there?
4
Name the somatic senses:
- mechanoreceptors
- nociceptors
- thermoreceptors
- chemoreceptors
What can mechanoreceptors detect?
- touch
- pressure
- vibration
- proprioception
What is proprioception?
Sense of movement and location
What do nociceptors detect?
- noxious stimuli ( painful/harmful)
What do thermoreceptors detect?
Temperature
What do chemoreceptors detect?
- chemicals (eg blood gasses)
How are mechanoreceptors triggered?
Physical distortion opens ion channels to make a receptor potential
Name three types of mechanoreceptors:
- proprioceptors
- barioceptors
- tactile receptors
Where would proprioceptors be found?
- muscle spindles
Hat do baroreceptors detect?
Blood pressure
What do tactile receptors detect?
- touch
- pressure
- vibration
What do myelinated free nerve endings in the skin usually detect?
- thermoreceptors detect change in temp
What do thinly or unmyelinated nerve endings in the skin usually detect?
- nociceptors
- detect mechanical, thermal, or chemical stimuli perceived as painful
What is a receptive field?
The receptive field is the nerve endings of any single receptor spread over a restricted area
What is the difference in localisation provided by big receptive fields vs smaller ones?
- big fields provide poor localisation
- small fields can detect very specific location
Are phasic or tonic receptors faster adapting?
Phasic
Are phasic or tonic receptors more superficial?
Phasic
Are phasic or tonic receptors contantly active?
Tonic
How do tonic receptors communicate a change in intensity of a stimulus?
Increased AP frequency until stimulus returns to normal
How many types of information is encoded in sensory stimuli?
4
Name the types of information coded in sensory stimuli:
- modality
- intensity
- duration
- location
