week11

the basilar membrane vibrates best at high frequency near the base of cochlea, the outer hair cells outnumber the inner hair cells, Na in peilymoh is greater than in the endolymoh

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the primary auditory cortex is located in the temporal lobe, the K in the endolymoh is very similar than in the hair cells, the basilar membrane separates the ductus cochlear is from the scala tympani, the entry of K ions on the top of. cilia causes the depolarization of hair cells

they amplify the movement of the tymanum, they transmit vibrations of the tympanum to the oval window

higher sound wave frequencies cause the largest displacement of BM near the base of the cochlea, the displacement of the BM increases with increasing interest with of acoustic signal, the BM oscillates in a traveling wave in response to a sound

the inner hair cells connect afferent and efferent nerve fibers

mechanisensitive cation channels allow th entry of K on top of cilia, scala media contains endolymph

the cilia of inner hair cells donot reach the membrane tectoria, the outer hair cells shorten in response to adequate stimuli, the threshold of inner cells depends on the outer hair cells

The auditory system interprets a sound as loud if amplitude of BM increases, a sound intensity of 20 db means 10 times of threshold pressure

in the cochlea, 90-95% of the afferent nerve fibers end on inner hair cells, the outer hair cells have efferent innervation

hair cells are always located between endolymoh and perilymph, It is a liquid that fills up the membrane labyrinth, its K is around 140-150 mM

the stretch of the tip link induces K influx into hair cells

if the Stereocilia of the hair cells bend towards the kinocilium the cells respond with depolarization, otolithic membrane can be found I the utricle, the vestibular hair cells release a basal amount of NT in resting state