Lec 14 Flashcards
Soundwave frequency
Hz
Sound wave intensity
dB
Outer ear
Pinna
Auditory canal
Tympanic membrane
Middle ear
Ossicles-
Malleus (hammer), Incus (anvil), stapes (stirrup)
Oval window
Inner ear
Cochlea
Where are hair cells
In the cochlea
What do cochlear hair cells lack
True kinocilium
Where do hair cells sit
On the basilar membrane
Sound wave travel process
Sound waves hit the tympanic membrane causing it to vibrate
Vibration transferred from malleus to incus to stapes
Oval window moves in and out, causing a wave in the perilymph, move the basilar membrane
Vestibular and tympanic duct are filled with what
Perilymph
Cochlear duct is filled with
Endolymph
What does movement of the basilar membrane do
It stimulates auditory hair cells
Tectorial membrane
Where the hairs of the hair cells are embedded to
When the basilar membrane vibrates, the hairs are sheared by the tectorial membrane
What does a healthy basilar membrane show
The outer hair cells respond to sound by slight tilting and changing length (motile response)
Sound localization is based on
Difference in time and intensity at the two ears
