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IHS Questions- For License PrepVerified 100% Correct.
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IHS Questions- For License PrepVerified 100% Correct.
The adult ear canal: Answer - Rises upward and forward then descends to the drum
The isthmus is: Answer - Where the canal narrows to enter the temporal bone
The pinna and the external canal together: Answer - -Gather and reinforce
accoustical signals
-With the irregular shape of the auricle, cause increases and decreases at different
frequencies as the sound arrives at the ear.
-Forms a resonating tube.
The average resonant frequency of the ear canal plus concha is: Answer - 2700 Hz.
The dividing line between the external ear and the middle ear is the: Answer -
Tympanic membrane.
The ear canal contains: Answer - Cilia, ceruminous glands. sebaceous glands.
The vagus nerve (Xth cranial) is found: Answer - Along the bottom of the ear canal.
These are parts of the tympanic membrane: Answer - Pars tensa, Pars flaccida,
Umbo.
An otoscopic inspection should reveal: Answer - A clear view of the white tympanic
membrane.
These are parts of the pinna: Answer - Tragus, intertragal notch, triangular fossa.
Atresia refers to: Answer - A closure of the external auditory canal.
Perforation of the eardrum can be caused by: Answer - -An infection
-A fracture of the temporal bone
-A nearby explosion.
These are types of hearing loss: Answer - -Conductive
-Central
-Sensorineural
Conductive losses may be caused by: Answer - A prolapsed canal
Impacted cerumen
Which surgical technique repairs the tympanic membrane? Answer - Myringoplasty
,A cholesteatoma can be described as: Answer - A pouch of skin filled with epithelial
debris.
When an excess of cerumen or a blockage of cerumen is detected, the hearing aid
specialist should: Answer - Refer the patient to a physician.
A swollen ear may be caused by: Answer - -Eczema
-Otitis externa
-Dermatitis
Tympanosclerosis may be described as: Answer - Calcium deposits.
A tympanic membrane perforation may cause a: Answer - Conductive loss.
Theoretically, the increase in sound pressure provided by the middle ear structure is
about: Answer - 27 dB.
The footplate of the stapes fits into the: Answer - Oval window.
A type "A" tympanogram would indicate: Answer - Normal pressure and compliance.
The difference in area size between the tympanic membrane an the footplate of the
stapes increasing the sound pressure at the footplate is : Answer - The transfer
function or aerial ratio.
The middle ear cavity contains: Answer - Annular ligaments, malleus, stapes and
tensor tympani.
The middle ear system is often referred to as: Answer - An impedance matching
transformer.
The middle ear cavity, as a transducer changes energy from one form to another.
The energy changes from: Answer - Acoustic energy to mechanical energy to
hydraulic energy.
The middle ear muscles contract, resulting in: Answer - An acoustic reflex.
The Eustachian tube begins in the lower portion of the tympanic cavity and ends at
the: Answer - Nasopharynx.
The Eustachian tube of a child is: Answer - Straight, short, horizontal.
A cholesteatoma: Answer - -Occurs in the middle ear
-May perforate the eardrum
-Is usually accompanied by a constant odorous discharge.
Change in either stiffness or mass occur when the normal middle ear function is
altered by disease or trauma causing: Answer - A feeling of stuffiness or a complaint
of hearing in a barrel.
, Otosclerosis: Answer - Occurs more often in women than men
Occurs more often in Caucasians than other races
Appears to be inherited
Most dysfunctions of the outer or middle ear cause a: Answer - Conductive loss.
Otitis media may occur with: Answer - Fluid in the middle ear.
A plastic or steel strut replaces the stapes during a: Answer - Stapedectomy.
Treatment for chronic otitis media may include: Answer - -Antibiotics
-Inflation of the Eustachian Tube
-Myringotomy
A radical mastiodectomy incudes removal of: Answer - Ossicular chain, mastoid.
The ossicular chain is supported and suspended by: Answer - Stapedius, tensor
tympani and ligaments.
The ear, due to its physical characteristics, enhances which frequencies? Answer -
2,000-5,000 Hz.
In a cross section of the cochlea, the minimum number of rows of hair cells you can
see is: Answer - 4
The total number of neural fibers or neurons in the human auditory nerve is about?
Answer - 30,000
The basilar membrane separates: Answer - The scala media and the scala tympani
The scala tympani is filled with: Answer - Perilymph
The base of the cochlea: Answer - begins at the oval window
The fibers of the auditory nerve, at the point of maximum stimulation of the basilar
membrane, discharge and recover at a rate of approximately: Answer - Up to 1Khz
identical to the stimulus frequency.
The cochlea, acting as a frequency analyzer, distributes acoustic stimuli to places
along the basilar membranes according to frequency, This forms the basis of a
hypothesis called the: Answer - Place theory.
Each of the semi-circular canals: Answer - -Are orinted at 90 degrees to one another.
-Contain perilymph and endolymph.
-Detect positioning and balance.
Collections of nerve fibers are called: Answer - Ganglia and nuclei.
Afferent fibers: Answer - Transmit from cochlea to the brain.
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