The somatovisceral sensory system Flashcards
1
Q
what are the 4 aspects that can be percived?
A
- modality
- intensity
- duration
- location
2
Q
what are the senses?
A
- vision
- hearing
- taste
- smell
- touch
3
Q
how can intensity be detected?
A
- action potential frecuency ( higher Hz of AP)
- population coding
- related but different type of receptors are activated
4
Q
what are rapidly adapting receptors?
A
- only detect a signal if its on and off quickly, they are surounded by a capsule.
- pacinian, meissners corpuscles and hair follicles
5
Q
what are slow adapting receptors?
A
- dont have a layered capsule
- tactile discs, ruffinis corpuscle, merkels corpuscle
6
Q
pacinian corpuscle?
A
- rapidly adapting
- muscle, subcutaneous
- vibration
- large receptive field
7
Q
ruffini corpuscle?
A
- slowly adapting
- stretch
- joint capsule
8
Q
meissner corpuscle
A
- rapidly adapting
- for touch
- dermis of non-hairy, fingertips, lips
- small receptive field
9
Q
merkel receptor?
A
- slowly adapting
- for pressure
- small receptive field
10
Q
thermoreceptors?
A
- no capsule
- slow adapting
- cold receptors–> A delta receptor
- warmreceptor–> c fibers
11
Q
medial leminiscus pathway?
A
- uses mechanoreceptor
- messiner, merkel, pacinian, ruffi
- fine touch, vibration, proprioception, two-point discrimination.
1. drg
2. gracile, cuneate nucleus–> medial leminiscus
3. VPL
4. cortex
12
Q
spinothalmic tract?
A
ant: crude touch
lat: pain, temp
