Audiology Praxis Study Guide UPDATED
ACTUAL Exam Questions and CORRECT
Answers
The Organ of Corti is composed of both sensory and support cells - CORRECT
ANSWER - True
It has both OHC and IHC as well as the support cells. Therefore, snesory and support cells
compose the organ of Corti.
The OHC(outer hair cells) are composed of 3-6 rows and number at least 15k to 25k -
CORRECT ANSWER - False
OHC usually comprise 3-4 rows and 12k to 20k (although you may see various numbers listed in
literature)
The primary blood supply is provided to the cochlea from? - CORRECT ANSWER -
Internal auditory artery
How long and how many turns is an adult cochlea? - CORRECT ANSWER - 2.5 turns and
is 30-35mm long.
Primary fluids found in cochlea - CORRECT ANSWER - perilymph and endolymph
The scala media is separated from the scala tympani by what structure? - CORRECT
ANSWER - Basilar membrane
OHC recieve about 5% of the innervation of the nerve fibers from the acoustic portion of the
VIIIth nerve. - CORRECT ANSWER - True
The scala tympani and scala vestibuli communicate through a small opening within the cochlea
called what? - CORRECT ANSWER - Helicotrema
,The membranous labyrinth attaches to what structure? - CORRECT ANSWER - Osseous
spiral lamina
Which is not a feature of the outer hair cells? - CORRECT ANSWER - not located on the
spiral lamina
Spontaneous otoacousitc emissions (SOAE) are consistent with subjective tinnitus. T/F? -
CORRECT ANSWER - False. SOAE are consistent with objective tinnitus.
Stimulus Frequency OAEs are clinically the most utilized OAE test. T/F? - CORRECT
ANSWER - False. Not used clinically at all DPOAE or TEOAEs have become the most
popular OAE tests.
The ionic composition of the endolymph contained within the scala media gives rise to an
electrical potential called? - CORRECT ANSWER - Endocochlear potential.
Who disovered OAEs? - CORRECT ANSWER - David Kemp
The organ of Corti contains 2 different types of sensory cells what are they? - CORRECT
ANSWER - Inner and Outer Hair cells.
The first comprehensive description of OAEs was published in 1977 and the first CPT codes
were introduced in 1994. T/F? - CORRECT ANSWER - False. Dr. Kemp published his
first description of OAE in 1978 and CPT in 1995
How much afferent innervation do inner hair cells have? - CORRECT ANSWER - 95%
afferent innervation
Describe the inward energy propagation as related to OAE? (think middle ear then cochlea) -
CORRECT ANSWER - Acoustic mechanical and bioelectric
, The foundation for the discovery of OAEs was developed by ? - CORRECT ANSWER -
Thomas Gold
Efferent innervation influences OHCs and thus influences OAEs. T/F? - CORRECT
ANSWER - True. The suppressive effects of efferent stimulation have been clearly
demonstrated since about 1950, this has been demonstrated with both ispilateral and contra
lateral presnetations of sound and effects on spontaneous, transient and dp oae's.
The OHC motility and the large # of OHCs are believed to be the contributor to the cochlear
amplifier theory. T/F? - CORRECT ANSWER - True.
The order of ossicles in relationship to the tympanic membrane moving media towards the
cochlea can best be described in this order. (name bones) - CORRECT ANSWER -
Malleus, incus, stapes.
OHC contract when their membrane is depolarized and elongate when hyperpolarized. T/F? -
CORRECT ANSWER - True.
TEOAEs are elicited by presenting a short duration pure tone into the ear. T/F? - CORRECT
ANSWER - False. They are elicited by using a click stimulus tone bursts or tone pips.
The normal cochlear process can best be described as nonlinear. T/F? - CORRECT
ANSWER - True
A thin layer of cells known as _____ separates the scala vestibuli from the scala media. -
CORRECT ANSWER - Reissners membrane.
The TM consists of 2 layers of skin. T/F? - CORRECT ANSWER - False, 3 layers.
ACTUAL Exam Questions and CORRECT
Answers
The Organ of Corti is composed of both sensory and support cells - CORRECT
ANSWER - True
It has both OHC and IHC as well as the support cells. Therefore, snesory and support cells
compose the organ of Corti.
The OHC(outer hair cells) are composed of 3-6 rows and number at least 15k to 25k -
CORRECT ANSWER - False
OHC usually comprise 3-4 rows and 12k to 20k (although you may see various numbers listed in
literature)
The primary blood supply is provided to the cochlea from? - CORRECT ANSWER -
Internal auditory artery
How long and how many turns is an adult cochlea? - CORRECT ANSWER - 2.5 turns and
is 30-35mm long.
Primary fluids found in cochlea - CORRECT ANSWER - perilymph and endolymph
The scala media is separated from the scala tympani by what structure? - CORRECT
ANSWER - Basilar membrane
OHC recieve about 5% of the innervation of the nerve fibers from the acoustic portion of the
VIIIth nerve. - CORRECT ANSWER - True
The scala tympani and scala vestibuli communicate through a small opening within the cochlea
called what? - CORRECT ANSWER - Helicotrema
,The membranous labyrinth attaches to what structure? - CORRECT ANSWER - Osseous
spiral lamina
Which is not a feature of the outer hair cells? - CORRECT ANSWER - not located on the
spiral lamina
Spontaneous otoacousitc emissions (SOAE) are consistent with subjective tinnitus. T/F? -
CORRECT ANSWER - False. SOAE are consistent with objective tinnitus.
Stimulus Frequency OAEs are clinically the most utilized OAE test. T/F? - CORRECT
ANSWER - False. Not used clinically at all DPOAE or TEOAEs have become the most
popular OAE tests.
The ionic composition of the endolymph contained within the scala media gives rise to an
electrical potential called? - CORRECT ANSWER - Endocochlear potential.
Who disovered OAEs? - CORRECT ANSWER - David Kemp
The organ of Corti contains 2 different types of sensory cells what are they? - CORRECT
ANSWER - Inner and Outer Hair cells.
The first comprehensive description of OAEs was published in 1977 and the first CPT codes
were introduced in 1994. T/F? - CORRECT ANSWER - False. Dr. Kemp published his
first description of OAE in 1978 and CPT in 1995
How much afferent innervation do inner hair cells have? - CORRECT ANSWER - 95%
afferent innervation
Describe the inward energy propagation as related to OAE? (think middle ear then cochlea) -
CORRECT ANSWER - Acoustic mechanical and bioelectric
, The foundation for the discovery of OAEs was developed by ? - CORRECT ANSWER -
Thomas Gold
Efferent innervation influences OHCs and thus influences OAEs. T/F? - CORRECT
ANSWER - True. The suppressive effects of efferent stimulation have been clearly
demonstrated since about 1950, this has been demonstrated with both ispilateral and contra
lateral presnetations of sound and effects on spontaneous, transient and dp oae's.
The OHC motility and the large # of OHCs are believed to be the contributor to the cochlear
amplifier theory. T/F? - CORRECT ANSWER - True.
The order of ossicles in relationship to the tympanic membrane moving media towards the
cochlea can best be described in this order. (name bones) - CORRECT ANSWER -
Malleus, incus, stapes.
OHC contract when their membrane is depolarized and elongate when hyperpolarized. T/F? -
CORRECT ANSWER - True.
TEOAEs are elicited by presenting a short duration pure tone into the ear. T/F? - CORRECT
ANSWER - False. They are elicited by using a click stimulus tone bursts or tone pips.
The normal cochlear process can best be described as nonlinear. T/F? - CORRECT
ANSWER - True
A thin layer of cells known as _____ separates the scala vestibuli from the scala media. -
CORRECT ANSWER - Reissners membrane.
The TM consists of 2 layers of skin. T/F? - CORRECT ANSWER - False, 3 layers.
