Ear fxn and testing Flashcards
where is cerumen produced
cartilaginous outer portion of outer ear
functions of tensor tympani
helps open eustacian tube
electrolyte levels of perilymph
high sodium, low potassium
where is the organ of corti? what two membranes does it contain
scala media; basilar and tectorial
follow path of sound wave in cochlea
oval window-scala vestibule-scala tympani-round window
describe roles of hair cells
outer-amplify, inner- create signal
where do high frequency sounds hit cochlea
base, high pitch=apex
how do inner hair cells signal
movement produces depolarization and increased signal frequency
what do we stimulate with a cochlear implant (and what IHC stimulate)
spiral ganglion cells in Rosental’s canal
components of central auditory nervous system
8th nerve, cochlear nucleus, superior olivary complex, lateral leminiscus, inferior colliculus,medial geniculate body, primary auditory complex
in what ear do most people do better linguistic processing
right ear; left cerebral hemisphere is linguistic
two types of hearing loss
conductive, sensorineural
what is the difference b/w a speech reception threshold and word recognition score
when sound is recognized as words. when words can be understood
what does reflex testing test
response of stapedius muscle to loud sound
Auditory brainstem response (ABR). What do absolute latencies suggest? Interpeak latencies?
like an ekg. impulse is generated and tracked though CANS; conductive issues; neural problems
