1
Q
What is the function of the external ear?
A
Collect sound waves
Conduct sound waves to typanic membrane Determine origin of sound waves
2
Q
What are the ducts of the membranous labyrinth
A
Scala vestibuli-superior
Scala media Scala typani-inferior
3
Q
Waht are teh membranes of the membranous laby
A
Reissner’s
-Floor of scala vestibuli -Roof of scala media
basilar
4
Q
What are the fluids of the ML?
A
Perilymph
Scala vestubli and tympani
Endolymph
Scala media
5
Q
What is the spiral ligament?
A
Outer wall of ML
Stria vascularis (replenishes endolymph)
6
Q
What is the organ of corti and structures?
A
It is the basal membrane
Tectorial membrane on top Reticular lamina Hair cells (inner and outer) Supporting cells Basilar membrane
7
Q
What hair cells are receptors for hearing?
A
inner hair cells
8
Q
What are the types of hearing loss?
A
conductive
sensorineural
9
Q
What causes conductive hearing loss?
A
Wax accumulates/stenosis/hyperplasia
Meds Infectious otitis media mass
10
Q
What causes sensorineural hearing loss?
A
Congential hereditary deafness
Drugs Noise induced hearing loss Presbycusis
