10 Ascending pathways Flashcards
1
Q
Hair follcile receptors:
- modality
- features
A
- touch
- rapidly adapting
2
Q
Merkel endings:
- modality
- features
A
- pressure, low freq vibration
- slowly adapting
3
Q
Meissner corpuscles:
- modality
- features
A
- light touch
- rapdily adapting
4
Q
Pacinian corpsucles:
- modality
- features
A
- vibration, JPS
- rapidly adapting
5
Q
Ruffini endings:
- modality
- features
A
- skin stretch, pressure, JPS
- slowly adapting
6
Q
Nociceptors:
- modality
- features
A
- pain
- free nerve endings
7
Q
Muscle spindles:
-modality
A
-muscle length, proprioception
8
Q
Golgi tendon organs:
- modality
- features
A
- JPS
- slowly adapting
9
Q
Aα axons (from skin):
- axons from muscles
- diameter (μm)
- speed (m/sec)
- sensory receptors
A
- group I
- 13-20
- 80-120
- proprioceptors of skeletal muscle
10
Q
Aβ axons (from skin):
- axons from muscles
- diameter (μm)
- speed (m/sec)
- sensory receptors
A
- group II
- 6-12
- 35-75
- mechanoreceptors of skin
11
Q
Aδ axons (from skin):
- axons from muscles
- diameter (μm)
- speed (m/sec)
- sensory receptors
A
- group III
- 1-5
- 5-30
- pain, temp
12
Q
C axons (from skin):
- axons from muscles
- diameter (μm)
- speed (m/sec)
- sensory receptors
A
- group IV
- 0.2-1.5
- 0.5-2
- temp, pain, itch
13
Q
What is the concept of lateral inhibition?
A
- each sensory neuron has a receptive field
- dendrites are dense at the centre and diffuse at the periphery
- situmuli at the cneter of the field activate more dendrites thatn at the periphery and so cause faster firing
14
Q
How does lateral inhibition relate to sensation?
A
sharpens discrimination between 2 points
15
Q
Clinical sensory testing for joint position sense
- why test
- other
A
- exclusively dorsal columns
- stabilise joint
