Ear Flashcards
Pinna is part of the ______ ear
outer
lateral 1/3 of the ear canal is ____
cartilaginous
Hairs and cerumen (ear wax) glands are located in the _______ part of the ear canal
lateral
Medial portion of the ear canal is ______
osseous (bony)
scala vestibuli and scala tympani both contain _______ fluid
perilymph
perilymph has _____ sodium and ______ potassium
high, low
Path of fluid wave in the inner ear
Stapes pushes against the oval window and sends a fluid wave up the cochlea
fluid wave goes up the scala vestibuli then back down the scala tympani and out the round window
When sound exits the the scala tympani it vibrates the scala media which vibrates the _________ , transducing sound
basilar membrane
The basilar membrane is located between the scala _____ and scala ______.
media, tympani
inner hair cells direct ___ hair cell tone one neuron.
one
outer hair cells depolarize and _______ the signal to the inner hair cells
amplify
inner hair cells depolarize and ______ the signal to the nerve
send
cochlear tuning occur by the basilar membrane varying its ____
stiffness
At the _____ of the cochlear the basilar membrane is the stiffest and transmits ______ frequency.
base, high
At the ______ of the cochlear the membrane is floppy and transmits _______ frequency
apex, low
The round window is near the _____ of the cochlear
base
Outer hair cells have ____ shaped stereocilia
V
Inner hair cells have _____ shaped stereocili
line
Hair on the stereocillia pulls the ionic channel open and _____ the cell.
depolarized
inner hair cells stimulate ____ cells
spiral ganglion
spiral ganglion cells are located in the ______ of the cochlea
modiolus
scala media is filled with ____
endolymph
spiral ganglion cells serve as _______ neurons that form the ______ nerve
afferent, vestibulocochlear
