The Ear

Question 1

What is the function of the external ear?

Answer 1

Collect sound waves

Conduct sound waves to typanic membrane  

Determine origin of sound waves

Question 2

What are the ducts of the membranous labyrinth

Answer 2

Scala vestibuli-superior

Scala media 

Scala typani-inferior

Question 3

Waht are teh membranes of the membranous laby

Answer 3

Reissner’s

-Floor of scala vestibuli 

-Roof of scala media  

basilar

Question 4

What are the fluids of the ML?

Answer 4

Perilymph

Scala vestubli and tympani 

Endolymph

Scala media

Question 5

What is the spiral ligament?

Answer 5

Outer wall of ML

Stria vascularis (replenishes endolymph)

Question 6

What is the organ of corti and structures?

Answer 6

It is the basal membrane

Tectorial membrane on top 

Reticular lamina 

Hair cells (inner and outer) 

Supporting cells 

Basilar membrane

Question 7

What hair cells are receptors for hearing?

Answer 7

inner hair cells

Question 8

What are the types of hearing loss?

Answer 8

conductive
sensorineural

Question 9

What causes conductive hearing loss?

Answer 9

Wax accumulates/stenosis/hyperplasia

Meds 

Infectious otitis media 

mass

Question 10

What causes sensorineural hearing loss?

Answer 10

Congential hereditary deafness

Drugs 

Noise induced hearing loss  

Presbycusis