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26 terms

Physio midterm review: lab 6: hearing and equilibrium

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where are the receptors for hearing located
cochlea-spiral shaped cavity of the inner ear-"snail shell"
parts of the outer ear
auricle [pinna], external auditory canal [meatus], and tympanic membrane [eardrum]
auricle [pinna]
responsible for collecting sound waves
external auditory canal [meatus]
directs collected sound waves towards the tympanic membrane [eardrum]
tympanic membrane [eardrum]
separates the outer ear from the middle ear; sound waves cause it to vibrate at the same frequency as the sound waves hitting it
parts of the middle ear
auditory ossicles and auditory tube [eustacian tube]
auditory ossicles
transmits and amplifies vibrations from the tympanic membrane to the oval window; made up of three parts: malleus [hammer], incus [anvil], and stapes [stirrup]
components of the auditory ossicles
malleus [hammer], incus [anvil], and stapes [stirrup]
auditory tube [eustacian tube]
connects the middle ear to the nasopharynx [upper portion of the throat]; equalizes air pressure on both sides of the tympanic membrane
parts of the inner ear
cochlea, semicircular canals, utricle, and saccule
cochlea
contains a series of fluids, channels, and membranes that transmits vibrations to the organ of corti; houses hair cells [receptors for hearing]
semicircular canals
contains receptors that help maintain dynamic equilibrium; has nothing to do with hearing
utricle and saccule
contains receptors that help in dynamic and static equilibrium
what are hair cells
receptors for hearing located in the cochlea
ossicles
located in the middle ear; transmits and amplifies vibrations from the tympanic membrane to the oval window; three parts: malleus [hammer], incus [anvil], and stapes [stirrups]
weber test
used to determine conduction and sensorineural deafness
sensorineural deafness
result of damage to the neural structures of the middle ear; damage to cochlear cells from prolonged exposure to higher frequencies [concerts]
weber test result for sensorineural deafness
the tone will be heard in the unaffected ear, but not in the ear with sensorineural deafness
weber test result for conduction deafness
the tone will be heard more strongly in the ear in which there is a hearing loss due to sound conduction by the bone of the skull
weber test procedure
strike a tuning fork and place the handle of the tuning fork medially on your partner's head
function of semicircular canals
contains receptors that have nothing to do with hearing; receptors help maintain dynamic equilibrium
static equilibrium
receptors provide sensory information on the spatial position of the head and help maintain posture and balance
dynamic equilibrium
receptors help maintain the position of the head in response to movement
conduction deafness
something interferes with the conduction of sound to the fluids of the inner ear; once blockage is removed sound can be restored
factors that may contribute to conduction deafness
wax blocking auditory canal, middle ear infections like otitis media
sensorineural deafness
result of damage to neural structures of the middle ear; damage to cochlear cells from prolonged exposure to high frequencies [concerts]; hearing can not be restored