Transcript Document

outer ear
anatomy
physiology
disorders
anatomy
pinna
anatomy
ear canal
anatomy
tympanic membrane
physiology
pinna
vertical localization
resonance
physiology
ear canal
pathway
protects TM
constant temp and humidity
resonator
physiology
tympanic membrane will be considered
along with the section on the middle ear
(chap 10)
disorders
atresia
collapsed ear canals
foreign bodies
external otitis
growths in ear canal
impacted cerumen
tympanic membrane perforations
tympanosclerosis
disorders
atresia
complete congenital closure of the ear canal
hearing loss: moderate flat conductive
treatment: surgery
disorders
typical atresia audiogram and photo
disorders
collapsed ear canals
artifact due to pressure of supraaural
earphones on ear canals
false conductive loss
disorders
foreign bodies
any foreign object in ear canal
no hearing loss
treatment involves removing object
disorders
examples of foreign bodies
disorders
external otitis (otitis externa)
bacterial or fungal infection of the ear canal
no hearing loss
anti-biotics used for treatment
disorders
growths in ear canal
osteotomas and extoses
normally no treatment or hearing loss
disorders
impacted cerumen
slight to mild sloping hearing loss
physical removal
disorders
impacted cerumen
disorders
tympanic membrane perforations
causes vary
usually no hearing loss
may heal spontaneously or require
myringoplasty
disorders
tympanosclerosis
ususally due to repeated scaring
no hearing loss to a mild rising loss
no known treatment
disorders
Most outer ear disorders have normal
acoustic immittance results
The exceptions are ...
atresia
impacted cerumen
tympanic membrane perforations
tympanosclerosis
summary