1000 Flashcards Hearing Instrument Specialist Exam
The external auditory canal amplifies sounds 2000-4000 Hz, which is crucial for speech understanding.
primarily in the ______ Hz range.
A patient has a collapsed ear canal when wearing The cartilaginous portion of the external auditory canal; it is flexible
headphones. What structure is likely affected and and can collapse under pressure, affecting sound conduction.
why?
The tympanic membrane directly transmits sound False. The tympanic membrane transmits vibrations to the ossicles,
vibrations to the cochlea. Justify. which then transfer energy to the cochlea.
Describe the role of the ossicular chain in The ossicles (malleus, incus, stapes) amplify sound by increasing
impedance matching. pressure from air to fluid medium, preventing sound reflection at the
oval window.
Which ossicle attaches to the tympanic The malleus; it receives vibrations from the tympanic membrane and
membrane, and what is its function? transmits them to the incus.
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,1000 Flashcards Hearing Instrument Specialist Exam
A patient has fixation of the stapes footplate. What Otosclerosis; it reduces sound transmission to the inner ear, causing
condition is suspected and what is the impact? conductive hearing loss.
The oval window connects the middle ear to the Cochlea (inner ear).
______.
Explain the function of the Eustachian tube in It equalizes air pressure between the middle ear and nasopharynx and
middle ear physiology. drains secretions.
The inner ear is filled entirely with perilymph. False. It contains both perilymph (scala vestibuli & tympani) and
Explain. endolymph (scala media).
Define the cochlea and its primary function. A spiral-shaped organ responsible for converting mechanical sound
vibrations into neural signals.
What is the organ of Corti and why is it critical? It contains hair cells that transduce mechanical vibrations into electrical
signals for hearing.
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,1000 Flashcards Hearing Instrument Specialist Exam
Inner hair cells are primarily responsible for ______, Signal transduction; amplification and fine-tuning.
while outer hair cells are responsible for ______.
Damage to outer hair cells leads to what type of Reduced sensitivity and poor frequency resolution, affecting clarity of
hearing issue? sound.
Explain tonotopic organization in the cochlea. High frequencies are detected at the base, low frequencies at the apex
of the cochlea.
The basilar membrane vibrates uniformly across all False. Different regions vibrate depending on frequency due to
frequencies. Explain. mechanical properties.
What is the role of the round window? It relieves pressure within the cochlea by allowing fluid displacement.
The scala media contains ______ fluid rich in Endolymph.
potassium.
Describe the vestibular system's primary function. It maintains balance and spatial orientation using semicircular canals
and otolith organs.
A patient reports vertigo when turning their head Semicircular canals, which detect angular acceleration.
quickly. Which structure is involved?
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, 1000 Flashcards Hearing Instrument Specialist Exam
Define neural transduction in hearing. Conversion of mechanical vibrations into electrical impulses by hair
cells.
What nerve carries auditory information to the The auditory (cochlear) branch of the vestibulocochlear nerve (CN
brain? VIII).
The first central relay station for auditory signals is Cochlear nucleus.
the ______.
The auditory pathway is strictly unilateral. Explain. False. It is bilateral, with signals crossing over at multiple brainstem
levels.
Explain the function of the superior olivary It processes binaural cues for sound localization (interaural time and
complex. intensity differences).
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The external auditory canal amplifies sounds 2000-4000 Hz, which is crucial for speech understanding.
primarily in the ______ Hz range.
A patient has a collapsed ear canal when wearing The cartilaginous portion of the external auditory canal; it is flexible
headphones. What structure is likely affected and and can collapse under pressure, affecting sound conduction.
why?
The tympanic membrane directly transmits sound False. The tympanic membrane transmits vibrations to the ossicles,
vibrations to the cochlea. Justify. which then transfer energy to the cochlea.
Describe the role of the ossicular chain in The ossicles (malleus, incus, stapes) amplify sound by increasing
impedance matching. pressure from air to fluid medium, preventing sound reflection at the
oval window.
Which ossicle attaches to the tympanic The malleus; it receives vibrations from the tympanic membrane and
membrane, and what is its function? transmits them to the incus.
1 of 109
,1000 Flashcards Hearing Instrument Specialist Exam
A patient has fixation of the stapes footplate. What Otosclerosis; it reduces sound transmission to the inner ear, causing
condition is suspected and what is the impact? conductive hearing loss.
The oval window connects the middle ear to the Cochlea (inner ear).
______.
Explain the function of the Eustachian tube in It equalizes air pressure between the middle ear and nasopharynx and
middle ear physiology. drains secretions.
The inner ear is filled entirely with perilymph. False. It contains both perilymph (scala vestibuli & tympani) and
Explain. endolymph (scala media).
Define the cochlea and its primary function. A spiral-shaped organ responsible for converting mechanical sound
vibrations into neural signals.
What is the organ of Corti and why is it critical? It contains hair cells that transduce mechanical vibrations into electrical
signals for hearing.
2 of 109
,1000 Flashcards Hearing Instrument Specialist Exam
Inner hair cells are primarily responsible for ______, Signal transduction; amplification and fine-tuning.
while outer hair cells are responsible for ______.
Damage to outer hair cells leads to what type of Reduced sensitivity and poor frequency resolution, affecting clarity of
hearing issue? sound.
Explain tonotopic organization in the cochlea. High frequencies are detected at the base, low frequencies at the apex
of the cochlea.
The basilar membrane vibrates uniformly across all False. Different regions vibrate depending on frequency due to
frequencies. Explain. mechanical properties.
What is the role of the round window? It relieves pressure within the cochlea by allowing fluid displacement.
The scala media contains ______ fluid rich in Endolymph.
potassium.
Describe the vestibular system's primary function. It maintains balance and spatial orientation using semicircular canals
and otolith organs.
A patient reports vertigo when turning their head Semicircular canals, which detect angular acceleration.
quickly. Which structure is involved?
3 of 109
, 1000 Flashcards Hearing Instrument Specialist Exam
Define neural transduction in hearing. Conversion of mechanical vibrations into electrical impulses by hair
cells.
What nerve carries auditory information to the The auditory (cochlear) branch of the vestibulocochlear nerve (CN
brain? VIII).
The first central relay station for auditory signals is Cochlear nucleus.
the ______.
The auditory pathway is strictly unilateral. Explain. False. It is bilateral, with signals crossing over at multiple brainstem
levels.
Explain the function of the superior olivary It processes binaural cues for sound localization (interaural time and
complex. intensity differences).
4 of 109
