Air Conduction
This symbol: X means what on an audiogram?
Unmasked Left ear Air Conduction
This symbol: < means what on an audiogram?
0-15 dB is defined as
Normal Hearing
The outer ear starts at the pinna, through the external auditory canal, and stops when it reaches the tympanic membrane.
Does bone conduction test the entire auditory system?
no - it tests the cochlea (inner ear)
This symbol: O means what on an audiogram?
Unmasked Right ear Air Conduction
This symbol: > means what on an audiogram?
Unmasked left ear bone conduction
Intensity of sound is measured by...
Decibels (dB)
What makes up the middle ear?
The tympanic membrane, the malleus, incus, stapes, and the eustachian tube
What is the name of the machine used to test hearing?
Audiometer
This symbol: ▢ means what on an audiogram?
Masked left ear air conduction
This symbol: ] means what on an audiogram?
Frequency of sound is measured by...
Hertz (Hz)
What makes up the inner ear?
The cochlea, three semicircular canals, vestibulocochlear nerve.
How do you calculate Pure Tone Average?
take the thresholds from 500 Hz, 1000 Hz, 2000 Hz. Add them up and divide by 3
Ex: 500 Hz: 5dB, 1000 Hz: 10 dB, 2000 Hz: 15 dB
5+10+15 = 30/3 = 10 dB PTA
This symbol: △ means what on an audiogram?
masked right ear air conduction
Masked right ear bone conduction
41-55 dB is defined as...
Which part of the ear allows for localization?
Pinna
When should a person wear hearing protection?
When exposed to loud noise for an extended amount of time
What is an air-bone gap?
A difference of 15 dB or more between air and bone conduction thresholds
What types of hearing loss have an air-bone gap and what types do not?
Air-Bone Gap: Conductive (normal bone conduction, abnormal air condution) & Mixed (abnormal bone conduction, abnormal air conduction)
No Air-Bone Gap: Normal (normal bone and air conduction thresholds) & Sensorineural (abnormal air conduction, abnormal bone conduction - within 10dB of each other)
What kind of hearing loss would be present if the air conduction threshold for the right ear was 70 dB at 1000 Hz and the bone conduction threshold for the right ear was at 20 dB
Mixed Hearing Loss:
- presence of air bone gap with abnormal bone and abnormal air conduction
What is the vestibular system responsible for?
Balance
Does culture evolve or stay the same overtime?
Culture is constantly evolving and we as humans are evolving with it.