A patient is admitted with a ruptured tympanic membrane (TM). This may result in a hearing loss due to the disruption of which function of the TM?
1. Separating the outer and inner ear
2. Vibrating with sound waves
3. Covering the eustachian tube
4. Covering the mastoid process
2
Rationale 1: The tympanic membrane separates the outer and middle ear, not the outer and inner ear.
Rationale 2: The TM vibrates in response to sound waves. If the TM is perforated, vibration is diminished.
Rationale 3: The tympanic membrane does not cover the eustachian tube, which connects with the middle ear.
Rationale 4: The mastoid process is part of the outer ear but is not covered by the TM.
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