Chapter 19: Ear (Clinical Correlates)
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9 Terms
Congenital hearing loss
it is the abnormality of the hair cells or auditory nerve ganglia or to structural defects in the external ear canal, eardrum, or ear ossicles
sensorineural loss
a congenital hearing loss caused by the abnormality in the auditory nerve ganglia
conductive hearing loss
a congenital hearing loss caused by the structural defects in the external ear canal, eardrum, or ear ossicles
stapes
what is the most common ear ossicle to be involved in conductive hearing loss
External ear defects
what ear defect is common and includes minor and severe abnormalities
Preauricular appendages and pits
what are the skin tags and shallow depressions anterior to the ear.
Treacher Collins Syndrome
malformations in the external ear and ear canal and the ear ossicles can all be involved in causing varying degrees of conductive hearing loss
1. prenatal infections [rubella, cytomegalovirus, herpes simplex]
2. prematurity
3. maternal diabetes
factors characterized by sensorineural defects.
Accutane [retinoids]
what can cause both type of deafness