Case 4 - Hair Cells Flashcards
what are the two types of hair cells
inner and outer hair cells
how many rows of inner hair cells are there
one row
how many rows of outer hair cells are therre
three and five at the apex
what are the inner hair cells
the sensory receptors. about 95% of the fibres of the auditory nerve that project to the brain arise from the inner hair cells
one spiral ganglion receives input from how many inner hair cells
one
how many spiral ganglia neuritis does each inner hair cell feed
about 10
where are the terminations on the outer hair cells Almost all from
the efferent axons that arise from cells in the superior olivary complex
what do outer hair cells act as
tiny motors that amplify the movement of the basilar membrane during low intensity sound stimuli
what are the outer hair cells in the basilar membrane referred to as
the cochlear amplifier
what does cochlear amplification occur s a result of
motor protiens present in the membranes of the outer cells
what do motor proteins do
change the length of outer hair cells
how do outer hair cells respond to sound
with both a receptor potential and a change in length
what is the hair cells motor driven by
the receptor potential and it does not use ATP as an energy source
is the hair cells motor system fast
extremely, as it must be able to keep up with movement induced by high grrqunecy sounds
what is the hair cells motor protein
prestin
