Physiology 6: Auditory System Flashcards
hair cells release ___ tonically onto efferent nerve endings
glutamate
what are cilia in hair cells responsible for?
stimulus responsive cation (K+) entry
how is K+ transport different in hair cells?
K+ goes in instead of out
air is __ dense than water
less
when the oval window is pushed in the round window is…
pushed out
reissner’s membrane separates?
scala vestibuli from scala media
the basilar membrane of the ear separates…
scala mia from scala tympani
what does the organ of corti do and where is it located?
transmits sound into nerve impulses
on basilar membrane
what kind of sound waves will disrupt the organ of corti at the end of the OW?
high pitch
low pitch sounds displace the organ of corti where?
cochlear end
what type of hair cell is most abundant?
outer hair cell
what happens when the hair cells move?
release of neurotransmitter which is then captured in nerve fibres
the more the hair cells bend..
the more firing
which type of hair cells are the main source of afferent signals
inner
which type of hair cells are the main source of efferent inputs
outer hair cells
length change of outer hair cells causes __ movement of the basilar membrane = more transduction
increased
name the 3 cochlear nuclei utilised by CNVIII
dorsal cochlear nucleus
posteroventral cochlear nuscleus
anteroventral cochlear nucleus
at what level in the central auditory pathway does our ability to locate sounds in space arise from?
lateral and medial superior olivary nucleus
what angle are the semicircular canals at to each other?
90 degrees
semicircular canals are filled with what fluid?
endolymph
the saccule moves in what plane?
vertical/sagittal
the utricle moves in what plane?
horizontal
where do hair cells in the inner ear lie?
the macula
which part of the macula is important for arranging otoconia/otolith and hair cells?
striola of the macula
