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Outer Ear Disorders
Exam 3
22
Audiology
Undergraduate 3
12/03/2013

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Cards

Term
Functions of the Outer Ear
Definition
1. Protect more delicate structures
2. Amplify high frequency sounds
3. Sound localization
Term
Components of the Outer Ear
Definition
1. Pinna (Auricle)
2. External Auditory Canal (EAC)
3. Tympanic Membrane
Term
Microtia
Definition
Abnormal smallness of the pinna, Down Syndrome
Term
Anotia
Definition
Absence of the pinna, Down Syndrome
Term
Congenital
Definition
Present from birth
Term
Atresia
Definition
Congentical absent or complete closure of the ear canal, Treacher Collins Syndrome
Term
Preauricular Tags
Definition
Epithelial mounds or pedunculated skin that arise near the front of the ear around the tragus
Term
Bifid Pinna
Definition
Double earlobe
Term
Atresia Audiogram Characteristics
Definition
Usually flat conductive loss, moderately severe-severe loss, unilateral or bilateral
Term
External Otitis
Definition
An infection in the skin of the external auditory canal, swimmers ear, can be painful, treated with antibiotics
Term
Impacted Cerumen
Definition
Excessive build up of ear wax in the external ear canal, water and cotton swaps and push wax father in canal, can produce mild-moderate conductive hearing loss
Term
Disorders of the Pinna
Definition
Microtia, Anotia
Term
Disorders of the External Auditory Meatus
Definition
• Atresia
• External Otitis
• Impacted Cerumen
• Foreign Bodies
• Tumors/Cysts
• Collapsed Ear Canal
Term
Tumors/Cyst
Definition
Tumors usually aren't malignant and usually aren't removed if they aren't affecting anything; cysts are a fluid filled sac
Term
Collapsed Ear Canal
Definition
Putting supra-aural headphones on collapse ear canal can produce a "fake" conductive loss, use insert earphones,
usually not more that 15-30dB loss, maybe a greater dip at 2000Hz
Term
Disorders of the Tympanic Membrane
Definition
Perforations (central, attic, marginal), Tympanosclerosis
Term
Causes for Tympanic Membrane Perferations
Definition
Traumatic perforations, to relieve pressure from middle ear infections
Term
Central TM Perforations
Definition
In pars tensa portion of TM
Term
Attic TM Perforation
Definition
In pars flaccid portion
Term
Marginal TM Perforation
Definition
At the edge of the margin of the membrane
Term
Myringoplasty
Definition
Surgical repair of a perforated tympanic membrane, graft using fascia
Term
Tympanosclerosis
Definition
Thickening of the tympanic membrane as a result of a middle ear infection, does not respond well to surgical or medical treatment
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