Term
| What sound freqs. does the pinna resonate to? |
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Definition
| 1800-2800 Hz (poss. up to 6KHz) |
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Term
| What sound freqs. does the EAM resonate to? |
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Definition
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Term
| What sound freqs. does the TM respond to? |
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Definition
| All across freq. spectrum |
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Term
| What holds the stapes into the oval window? |
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Definition
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Term
| What is the purpose and location of the pars tensa? |
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Definition
Purpose- stiffens to allow vibration of freqs. to occur
Location- Lower 2/3rds of TM |
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Term
| What is the incudomalleolar joint? |
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Definition
| The joint between the malleus and incus |
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Term
| What is the incudostapedial joint? |
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Definition
| The joint between the incus and stapes |
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Term
| What is the purpose and location of the salpingo pharyngeus muscle? |
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Definition
Purpose- opens and closes proximal end of EU tube during swallowing/allows air exchange in middle ear cavity (MEC)
Location- sphincter muscle around proximal end of EU tube |
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Term
| What is the purpose and location of the levator palatini muscle? |
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Definition
Purpose- elevates the soft palate in assisting swallowing.
Location- Sits inferior to EU tube and superior to palate |
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Term
| The TM can vibrate in how many directions simultaneuously? |
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Definition
| 3. In a radial pattern, in patches >60 dBs, and back/forth |
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Term
| Function of medial 2/3rds of TM? |
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Definition
| protection, resonation, and pressure exchange |
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Term
| Function of Eustachain Tube |
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Definition
| Pressure equalization of middle ear and atmosphere |
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Term
| Function of Tensor Tympani |
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Definition
1. Stiffens w/ lower freqs.
2. Relaxes w/ higher freqs.
3. Tones TM; makes sure lower freqs. don't drown out higher freqs.
4. Pulls on manubrium to stop vibrations of lower freqs. to allow high freqs. in |
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Term
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Definition
| Protects hearing from loud sounds; muscle contract and holds stapes in place to protect cochlea |
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Term
| Function of Pars Flaccida |
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Definition
| Keeps TM from rupturing; takes slack during pressure changes |
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Term
| Function of lateral 1/3 of EAM |
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Definition
Keeps EAM moist/ natural insecticide
Contains Celia and cerumen |
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Term
| dB boosts with Auditory system |
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Definition
TM 10dB
Ossicles 10dB
Pinna 5-7dB
EAM 10dB
Tympanic Cavity 6dB |
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Term
| When posterior localization is learned |
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Definition
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Term
| When lateral/lower localization is learned |
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Definition
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Term
| When upper/superior localization is learned |
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Definition
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Term
| Benefits of having 2 pinnae |
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Definition
1. Localization
2. Aesthetics
3. Gains in dB (5-7dB/ear) |
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Term
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Definition
| Groove in which TM sits and hold TM and malleus together by a mucous membrane |
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