The tympanic membrane

safaTerkawi

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2022-08-10

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The tympanic membrane.

Modifies the frequencies of sound waves impinging on the ear.
Stops vibrating almost immediately after the sound stops.
Bulges outwards when the pharyngotympanic tube is blocked.
Transmits sound more effectively when the small muscles of the middle ear are contracted.
Cannot transmit sound waves if it is perforated.

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safaTerkawi

2022-08-10

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A. False It faithfully reproduces the frequencies.

B. True It is very nearly ‘critically damped’.

C. False It bulges inwards as middle ear air is absorbed.

D. False Reflex contraction of these muscles protects by damping vibration transmission.

E. False Small perforations cause about 5 decibels loss; complete destruction about 50.

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