audiology

Prevalence of hearing loss increases as we age- true Incidence is the number of cases of disease in a given population- true

100

Which one is the largest tract of the central auditory pathway?

Lateral lemniscus (tract) 

200

The outer layer of TM is called?

Epithelium/skin 

300

Which one is not a part of the central auditory pathway?

Superior colliculus- related to sight (visual field) 

400

This is the middle layer of the TM?

Fibrous 

1. epithelium

2. fibrous 

3. Mucous 

500

How many displays is 3 Pa?

103 dB spl

20 log= 3/2x 10^-5 

this is the current entry level for audiologists- doctor of audiology- AuDHigh frequencies are represented at the base of the cochlea- true Apex- low, base- high

100

Loss of outer hair cells results in mild hearing loss? True or false 

True 

200

This is the nerve that innervates the stapedius muscle?

Facial, CN 7, produces tear, tear glands 

produces for the taste buds- anterior 2/3 of tongue 

300

This is the smaller portion of the tympanic membrane?

Pars flaccida- does not have fat (fibrous layer) only has 2 layers 

400

This is the approximate length of the external auditory canal in an average adult? 

28 mm (3cm) about an inch and a quarter 

500

How many dB spl is 12 Pa?

115 dB spl 

double pa goes up 6 

goes down by 6 pa 

smallest bone of body is- the stapes/footplateThis nerve innervates the tensor tympani- CNS- TrigeminalFacial- movementTrigeminal- sensation

100

Loss of inner hair cells result in severe hearing loss? True or false 

True 

200

This is the ratio between the tympanic membrane and the footplate of stapes?

Areal ratio- 17 times bigger

300

This muscle which is contracted during acoustic reflex? 

Stapedius- connects to stapes, pulls stapes back- CN 7 facial nerve 

tensor tympani- Trigeminal 5- 3 branches 

400

The approximate resonant frequency of the external ear canal?

2500 Hz

natural hearing aid- ear

17 dBspl  amplification in the ear 

children’s resonant frequency is higher 

500

What is the speed of sound in air at 0 degrees centigrade? 

330 m/sec 

when it goes faster than sound- acoustic boom 

tectorial membrane touches the stereocilia of outer hair cells- true, the outer hair cells to activate

100

Inner hair cells are mainly innervated by efferent fibers . True or false 

False. Innervated by Afferent fibers 

200

This membrane is positioned above the stereocilia of outer and inner hair cells?

Tectorial membrane 

300

This tube connects middle ear to the nasopharynx?

eustatian tube- problematic part for children 

400

Scala tympani is filled with this fluid?

Perilymph 

SM= endolymph 

ST- perilymph 

SV- perilymph 

500

This is the approximate number of Americans in millions with hearing loss?

35 million (around 10 percent of population)

endolymph is similar to CSF- false Perilymph is similar to CSF

100

Efferent fibers are what?

CNS to PNS, brain to body (periphery) 

200

Otoacoustic emissions are sensitive to the function of this type of hair cells?

Outer hair cells 

300

What is the frequency of a pure tone with a period of .01 seconds?

F= 1/T F= 1/.01 =100 Hz (low frequency) (apex) 

400

How many dB spl is 6 Pa?

20 log= 6/2 X 10^-5 

= 3 log = .47 

20(.47+5) =109.4 

= 109 dB spl 

500

The number of cases of a disease is called?

Prevalence