Lecture 11: sensory systems

Question 1

what’s the role of of peripheral receptor cells?

Answer 1

translate external information to

the language of action potentials that brain understands

Question 2

what are the Peripheral receptor organs?

Answer 2

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

Question 3

How does sensory transduction work?

Answer 3

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

Question 4

what kind of changes happen in membrane potential?

Answer 4

depolarisation

hyperpolarisation

Question 5

whats the issue with graded potentials?

Answer 5

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

Question 6

A certain stimulus is needed for a …..

Answer 6

change to happen

Question 7

what are general features of sensory cells?

Answer 7

Receptive field
Quality (Tuning)
Adaptation

Question 8

stimulus only works if its on the correct..

Answer 8

sensory surface

Question 9

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

Answer 9

retina

Question 10

cells in the skin respond to _____

Answer 10

touch

Question 11

what is the receptive field on the skin?

Answer 11

area of skin where stimulation causes a response

Question 12

can receptive filed vary in size?

Answer 12

yes

Question 13

what is tuning?

Answer 13

the range of the stimulus over which a cell responds

Question 14

whats an example of tuning?

Answer 14

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

Question 15

hat are rapidly adapting cells known as?

Answer 15

phasic

Question 16

what are slowly adapting cells known as?

Answer 16

tonic

Question 17

How is sensory information is delivered

from peripheral receptors to the CNS?

Answer 17

via the cranial nerves and spinal nerves

Question 18

how many cranial nerves are there?

Answer 18

12 pairs

Question 19

How many spinal nerves are there ?

Answer 19

31 pairs

Question 20

what do Primary sensory afferents do?

Answer 20

Relay stimuli info from the periphery to the CNS

Question 21

what is the role of the thalamus?

Answer 21

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.

Question 22

read slide

Answer 22

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