Sensory Physiology and motor function Flashcards
1
Q
What do the senses do?
A
- Information on your surroundings
- Processed in the CNS
2
Q
Mechanoreceptors
A
- ear
- muscle and joints
- skin and viscera
- cardiovascular
3
Q
Thermoreceptors
A
skin and CNS
4
Q
Nociceptors
A
Respond to stimuli that result in sensation of pain
5
Q
Stages of sense and function
A
- Stimulus
- Receptor
- Change in membrane potential
- Generation of action potential
- Transmission to CNS
- Integration of information by CNS
6
Q
Sensory unit
A
single afferent neuron and all of its
receptor endings
7
Q
Receptors of sensory neurones may have
A
- Neuron with free nerve endings
- Neuron with encapsulated ending
- Specialised receptor cells closely associated
with neuron
8
Q
Enviromental change impacting sensory receptors
A
- Cause a change in membrane potential in receptor
- Generated potential is greaded
- Reach threashold to cause action potential
- Goes to the brain via ascending fibres, afferent nerve fibres
9
Q
Stimulus threshold
A
- Stronger stimulus larger graded receptor potential
- More frequent action potentials
- Therefore more neurotransmitter released
- AP not graded
10
Q
Receptor field
A
- Region of space where the presence of a
stimulus will induce the production of a
signal in that neuron - Smaller the receptive fields, the more
accurate a representation of the stimulus - Brain cant differentiate between 2 stimulus in same receptive field
11
Q
Somatic nervous system
A
- Perception of touch, temperature, body position,pain
- Received from receptors within the skin,
muscles, and joints - Responses voluntary AND involuntary
12
Q
Free nerve endings
A
Temperature,
noxious stimuli, hair
movement
13
Q
Somatosensory pathways
A
- Take the message
to the spinal cord and brain - Three neurones which synapse in the spinal cord and in thalamus
14
Q
Dorsal column lemniscal
A
- Fine touch, vibration and
position
15
Q
Spinothalamic
A
crude touch temperature, and
pain
