BRS Auditory Flashcards
intensity
Measured in decibels
dB= 20 log P/ Po
decibel (dB)= logarithmic unit that expresses the ratio of two values of a physical quantity, often power or intensity
frequency
measured in hertz
hertz= equal to one cycle per second.
___________ are of clinical significance because of their susceptibility to damage by ototoxic antibiotics and prolonged exposure to loud sounds.
Outer hair cells
Often antibiotics, cisplatin, aspirin
Outter ear
directs sound into auditory canal
Middle ear
air filled
tympanic membrane, auditory ossicles, oval window
Sound waves cause _______ to vibrate
Tympanic membrane
Ossicles vibrate in response
Ossicles vibrate in response to tympanic membrane, and push:
stapes into the olav window
stapes pushing into into the olav window causes
displacement of fluid in the inner ear
Calyx of held (lecture)
largest synapse in the brain
anteroventral cochlear nucleus (AVCN) send axons to the contralateral medial nucleus of the trapezoid body (MNTB), where they synapse via these calyces
project to the ipsilateral lateral superior olive, where they inhibit postsynaptic neurons and provide a basis for interaural level detection (ILD), required for high frequency sound localization.
Sound amplification
lever action of ossicles
concentrates sound from large tympanic membrane onto smaller oval window
Bony labyrinth
rigid, bony outer wall of the inner ear. It consists of three parts: the vestibule, semicircular canals, and cochlea.
membranous labyrinth
the location for the receptor cells found in the inner ear.
Perilymph is?
scala vestibuli, scala tympni
↓ K ↑ Na
Endolymph is
Scala media
↑ K
Scala media is the bordered by ______
Basilar membrane, site of organ of corti
