Lecture 11: sensory systems Flashcards

1
Q

what’s the role of of peripheral receptor cells?

A

translate external information to

the language of action potentials that brain understands

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2
Q

what are the Peripheral receptor organs?

A
sight 
gustation 
olfaction 
vestibular sense of equalibrium 
hearing 
touch 
pain
temp
proprioreception
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3
Q

How does sensory transduction work?

A

stimulus
sensory receptor
receptor potential (opening ion channel)
activation potential

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4
Q

what kind of changes happen in membrane potential?

A

depolarisation

hyperpolarisation

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5
Q

whats the issue with graded potentials?

A

they decline rapidly with distance so have to become an action potential.

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6
Q

A certain stimulus is needed for a …..

A

change to happen

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7
Q

what are general features of sensory cells?

A

Receptive field
Quality (Tuning)
Adaptation

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8
Q

stimulus only works if its on the correct..

A

sensory surface

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9
Q

for a neurone in the visual Corte the sensory surface would be …

A

retina

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10
Q

cells in the skin respond to _____

A

touch

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11
Q

what is the receptive field on the skin?

A

area of skin where stimulation causes a response

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12
Q

can receptive filed vary in size?

A

yes

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13
Q

what is tuning?

A

the range of the stimulus over which a cell responds

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14
Q

whats an example of tuning?

A

In the auditory system, nerve fibres are tuned to a narrow band of frequencies

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15
Q

hat are rapidly adapting cells known as?

A

phasic

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16
Q

what are slowly adapting cells known as?

A

tonic

17
Q

How is sensory information is delivered

from peripheral receptors to the CNS?

A

via the cranial nerves and spinal nerves

18
Q

how many cranial nerves are there?

A

12 pairs

19
Q

How many spinal nerves are there ?

A

31 pairs

20
Q

what do Primary sensory afferents do?

A

Relay stimuli info from the periphery to the CNS

21
Q

what is the role of the thalamus?

A

central brain structure that acts
as a relay centre for sensory information propagating
to the cortex. It also receives strong feedback input
from the cortex.

22
Q

read slide

A

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