what’s the role of of peripheral receptor cells?
translate external information to
the language of action potentials that brain understands
what are the Peripheral receptor organs?
sight gustation olfaction vestibular sense of equalibrium hearing touch pain temp proprioreception
How does sensory transduction work?
receptor potential (opening ion channel)
what kind of changes happen in membrane potential?
whats the issue with graded potentials?
they decline rapidly with distance so have to become an action potential.
A certain stimulus is needed for a …..
change to happen
what are general features of sensory cells?
stimulus only works if its on the correct..
for a neurone in the visual Corte the sensory surface would be …
cells in the skin respond to _____
what is the receptive field on the skin?
area of skin where stimulation causes a response
can receptive filed vary in size?
what is tuning?
the range of the stimulus over which a cell responds
whats an example of tuning?
In the auditory system, nerve fibres are tuned to a narrow band of frequencies
hat are rapidly adapting cells known as?
what are slowly adapting cells known as?
How is sensory information is delivered
from peripheral receptors to the CNS?
via the cranial nerves and spinal nerves
how many cranial nerves are there?
How many spinal nerves are there ?
what do Primary sensory afferents do?
Relay stimuli info from the periphery to the CNS
what is the role of the thalamus?
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.