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HESP 311


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Speech Banana
The shape on an audiogram which maps all of the necessary sounds for speech.
Toward Front
Toward Back
Toward outsides
Toward midline
Toward upper surface
Toward lower/bottom surface
further from the beginning.
toward the beginning
On the opposite side.
On the same side
Air conduction test range (Hz)
250 - 8,000 Hz
Air conduction octave intervals
250, 500, 1k, 2k, 4k, 8k Hz
Bone conduction test range
250 - 4,000 Hz
Bone conduction octave intervals
250, 500, 1k, 2k, 4k Hz
Why do we test a specific range of hearing?
The specific range captures hearing within the range of speech sounds.
Profound HL
91+ dB
Severe HL
71 - 90 dB
Moderately Severe HL
56 - 70 dB
Moderate HL
41 - 55 dB
Mild Hearing Loss
21 - 40 dB
Normal Hearing
-10 - 20 dB
We report thresholds in how many dB increments?
5dB increments
Audiogram intensity is reported as...
Red and Blue
Right and Left
Ultra-high frequencies
>8,000 Hz (9,000 - 20,000Hz)
Air conduction inter-octaves...
750, 1500, 3k, 6k
Conductive Hearing Loss (CHL)
Bone conduction tresholds are WNL, but air conduction seems impaired.
Air-bone gap
What can cause an "attenuation" of sounds?
Conductive hearing loss.
What does a "notched" audiogram usually indicate, when the HL is in higher frequencies?
This usually indicates a conductive hearing loss due to environmental sound hazards.
Sensorineural Hearing Loss (SNHL)
Hearing loss by both BC and AC by the same amount (ie, <=10 dB A-B gap).
Mixed Hearing Loss
>10dB A-B gap, wherein both BC and AC are outside of normal range.
Why can AC thresholds never be better than BC thresholds?
Seriously, do I have to explain this? :B
Speech Recognition Threshold (SRT)
Lowest intensity level at which speech can be recognized 50% of the time.
Speech Awareness Threshold (SAT)
Lowest intensity level at which the presence of speech can be detected. This is generally lower than SRT.
What is the required equipment for SRT tests or Word Recognition testing?
Audiometer, transducers.
Word Recognition Scores: Excellent, Good, Fair, Poor. Give the corresponding %.
90-100%, 80-89%, 70-79%, <70%
SRT: Words may be presented...
at suprathreshold level.
SRT is used to indicate...
whether the hearing loss is distorting the speech signal.
The main external structures on the pinna are...
The helix, fossa, concha, antihelix, crus, tragus, antitragus and lobe.
The helix of the pinna is:
The outer rim
The antihelix of the pinna is:
parallel to the helix.
The tragus of the pinna is:
anterior to the external auditory canal.
One purpose of the tragus is:
To protect the ear canal.
The crus of the pinna is:
Superior to the tragus.
The lobe is mostly made of:
fatty tissue.
The concha's diameter is approx:
1 to 2 cm in adults.
The concha leads to the opening of the external auditory canal with a diameter of:
5 to 7mm.
The average length of the external auditory canal is:
2 to 3cm
The average diameter of the external auditory canal is:
The medial 2/3 of the EAC is:
bony, with tight skin lining close to the TM.
The cartelagenous portion of the EAC is:
lined with hair and sebaceous and ceruminous glands.
The External Auditory Canal (EAC) is also known as:
The External Auditory Meatus (EAM)
Protective features of the EAC include:
S-shape, hair, cerumen, migratory epithelial tissues.
The pinna can amplify sound by:
The pinna is particularly good at collecting:
High frequency energy.
The external ears work together for what auditory process?
The superior portion of the EAC is innervated by:
CNV (Trigeminal nerve)
CNV is also called:
The trigeminal nerve.
CNV also innervates:
The mouth, nasal cavity, teeth, face, and gums.
The inferior portion of the EAC is innervated by:
CNX (Vagus nerve)
CNX is also called:
Vagus nerve
CNX/Vagus nerve innervates:
The tongue, larynx, and pharynx
Because of CNX's path of innervation, it can influence which reflexes?
The cough and gag reflex.

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