Auditory System Flashcards
what causes impedance in the auditory system?
How is this problem fixed?
- air to fluid
- fixed with oval window, ear drum and lever action of the ossicles
what happens to the fluid when the stapes pushes on the oval window?
the round window goes out b/c you can’t compress a fluid
when is a sound produced?
when the frequency is matched in the endolymph in the cochlea.
where in the cochlea are low frequency sound waves matched and made into sound?
the apical end
where in the cochlea are high frequency sound waves matched and made into sound?
the basal end (beginning)
what is phase locking?
signals become synchronized and send them out
tectoral membrane significance?
hair bundles bang on the tectoral membrane and the potential difference btwn the endolymph and the perilymph depolarizes
the auditor nerve goes to what 3 nuclei?
- dorsal cochlear nucleus
- postero-ventral cochlear nucleus
- antero-ventral cochlear nucleus
the nuclei related to the auditory nerve then send axons up the ___________ to the brainstem
lateral lemniscus
what area does the processing of sound begin?
- dorsal cochlear nucleus
- postero-ventral cochlear nucleus (intermediate)
- antero-ventral cochlear nucleus
where you you located sound in space?
- Lateral superior olive
2. Medial superior olive
Where do you form a full spatial map?
inferior colliculus
where is sound relayed to cortical areas?
medial geniculate
where are complex sounds identified and processes
cortex
what nucleus bypasses the superior olive?
dorsal cochlear nucleus
the 3 main nuclei of the auditory systems all converge where?
inferior colliculus
how is the primary auditory cortex organized !
tonotopically
perception of low and high frequency sounds are interpreted?
low frequency = scary
high frequency = nice, how you talk to little kids
where is wernicke’s area located?
btwn the pariental and temporal lobe
function of wernicke’s area?
integrate speech
function of broca’s area
organize speech
what is the flow of signal from the auditory cortex to the motor area to initiate speech?
- primary auditory cortex
- wernicke’s area
- Broca’s area
- Motor area
