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The .adult .ear .canal: .- .CORRECT .ANSWER-Rises .upward .and .forward .then
.descends .to .the .drum
The .isthmus .is: .- .CORRECT .ANSWER-Where .the .canal .narrows .to .enter .the
.temporal .bone
The .pinna .and .the .external .canal .together: .- .CORRECT .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: .- .CORRECT
.ANSWER-2700 .Hz.
The .dividing .line .between .the .external .ear .and .the .middle .ear .is .the: .-
.CORRECT .ANSWER-Tympanic .membrane.
The .ear .canal .contains: .- .CORRECT .ANSWER-Cilia, .ceruminous .glands.
.sebaceous .glands.
The .vagus .nerve .(Xth .cranial) .is .found: .- .CORRECT .ANSWER-Along .the .bottom
.of .the .ear .canal.
These .are .parts .of .the .tympanic .membrane: .- .CORRECT .ANSWER-Pars .tensa,
.Pars .flaccida, .Umbo.
An .otoscopic .inspection .should .reveal: .- .CORRECT .ANSWER-A .clear .view .of
.the .white .tympanic .membrane.
These .are .parts .of .the .pinna: .- .CORRECT .ANSWER-Tragus, .intertragal .notch,
.triangular .fossa.
Atresia .refers .to: .- .CORRECT .ANSWER-A .closure .of .the .external .auditory .canal.
Perforation .of .the .eardrum .can .be .caused .by: .- .CORRECT .ANSWER--An
.infection
,-A .fracture .of .the .temporal .bone
-A .nearby .explosion.
These .are .types .of .hearing .loss: .- .CORRECT .ANSWER--Conductive
-Central
-Sensorineural
Conductive .losses .may .be .caused .by: .- .CORRECT .ANSWER-A .prolapsed .canal
Impacted .cerumen
Which .surgical .technique .repairs .the .tympanic .membrane? .- .CORRECT
.ANSWER-Myringoplasty
A .cholesteatoma .can .be .described .as: .- .CORRECT .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: .- .CORRECT .ANSWER-Refer .the .patient .to .a .physician.
A .swollen .ear .may .be .caused .by: .- .CORRECT .ANSWER--Eczema
-Otitis .externa
-Dermatitis
Tympanosclerosis .may .be .described .as: .- .CORRECT .ANSWER-Calcium
.deposits.
A .tympanic .membrane .perforation .may .cause .a: .- .CORRECT .ANSWER-
Conductive .loss.
Theoretically, .the .increase .in .sound .pressure .provided .by .the .middle .ear
.structure .is .about: .- .CORRECT .ANSWER-27 .dB.
The .footplate .of .the .stapes .fits .into .the: .- .CORRECT .ANSWER-Oval .window.
A .type ."A" .tympanogram .would .indicate: .- .CORRECT .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 .: .- .CORRECT
.ANSWER-The .transfer .function .or .aerial .ratio.
The .middle .ear .cavity .contains: .- .CORRECT .ANSWER-Annular .ligaments,
.malleus, .stapes .and .tensor .tympani.
The .middle .ear .system .is .often .referred .to .as: .- .CORRECT .ANSWER-An
.impedance .matching .transformer.
, The .middle .ear .cavity, .as .a .transducer .changes .energy .from .one .form .to
.another. .The .energy .changes .from: .- .CORRECT .ANSWER-Acoustic .energy .to
.mechanical .energy .to .hydraulic .energy.
The .middle .ear .muscles .contract, .resulting .in: .- .CORRECT .ANSWER-An
.acoustic .reflex.
The .Eustachian .tube .begins .in .the .lower .portion .of .the .tympanic .cavity .and
.ends .at .the: .- .CORRECT .ANSWER-Nasopharynx.
The .Eustachian .tube .of .a .child .is: .- .CORRECT .ANSWER-Straight, .short,
.horizontal.
A .cholesteatoma: .- .CORRECT .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: .- .CORRECT .ANSWER-A .feeling .of
.stuffiness .or .a .complaint .of .hearing .in .a .barrel.
Otosclerosis: .- .CORRECT .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: .- .CORRECT .ANSWER-
Conductive .loss.
Otitis .media .may .occur .with: .- .CORRECT .ANSWER-Fluid .in .the .middle .ear.
A .plastic .or .steel .strut .replaces .the .stapes .during .a: .- .CORRECT .ANSWER-
Stapedectomy.
Treatment .for .chronic .otitis .media .may .include: .- .CORRECT .ANSWER--
Antibiotics
-Inflation .of .the .Eustachian .Tube
-Myringotomy
A .radical .mastiodectomy .incudes .removal .of: .- .CORRECT .ANSWER-Ossicular
.chain, .mastoid.
The .ossicular .chain .is .supported .and .suspended .by: .- .CORRECT .ANSWER-
Stapedius, .tensor .tympani .and .ligaments.
The .ear, .due .to .its .physical .characteristics, .enhances .which .frequencies? .-
.CORRECT .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: .- .CORRECT .ANSWER-4