Middle ear
What are the three ossicles (bones) in the middle near
1. malleus
2. incus
3. stapes
What connects the nasopharynx to the middle ear
The Eustachian tube
This is the resonance frequency of the ear canal
2500 HZ
How many Outer hair cells do we have
12,000-16,000
This is where labyrinth is embedded
petrous bone
What layer is the pars flaccid missing?
The fibrous layer
What is the difference between the eustachian tube in children vs adults
children adults
1. shorter more diagnional
2. wider
3. flatter
This is the C- shaped portion of the outer ear that projects outward
pinna
How many inner hair cells do we have?
3,000-4,000
How many times does the cochlea wrap around itself
two and half times
The _______ is the outer rim of the tympanic membrane
annulus
Which nerve innervates the tensor tympani muscle
the fifth (trigeminal) cranial nerve
This makes up the inner 1/3 of the ear
bone
This organ sits on the Basilar membrane
organ of corti
This is the fluid that is in scala tympani and vestibuli
perilymph
Where is the middle ear located?
inside the temporal bone
This is the nerve that innervates the stapedius muscle
the seventh (facial) nerve
This makes up the outer two-thirds of the outer ear
cartilage
True or false: The tectorial membrane touches the stereocilia of the outer hair cells
True
This is the fluid that is in scala media
endolymph
What does the footplate of stapes cover?
the oval window
This is the ratio between the tympanic membrane and the footplate of stapes
the areal ratio
This is the length of the external ear canal
28 mm (3 cm)
Are high frequencies at the base of the cochlea or the apex
base
Are low frequencies at the base of the cochlea or the apex
apex