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The structure which opens in the nasopha...

The structure which opens in the nasopharynx that permits air pressure on both sides of tympanic membrane of the ear to be kept equalis :-

A

Oval window

B

Tube of cochlea

C

Auditory nerve

D

Eustachian tube

Text Solution

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The correct Answer is:
To answer the question regarding the structure that opens in the nasopharynx and helps equalize air pressure on both sides of the tympanic membrane, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Function of the Structure**: The question asks for a structure that allows air pressure to be equalized on both sides of the tympanic membrane (eardrum). This is crucial for proper hearing and balance. 2. **Understand the Anatomy Involved**: The tympanic membrane is located in the middle ear. For air pressure to be equalized, there needs to be a connection between the middle ear and another cavity that can allow airflow. 3. **Consider the Options Provided**: The options include: - Oval window - Tube of cochlea - Auditory nerve - Eustachian tube 4. **Analyze Each Option**: - **Oval Window**: This structure is involved in transmitting sound vibrations from the middle ear to the inner ear but does not connect to the nasopharynx. - **Tube of Cochlea**: This is part of the inner ear and is not involved in pressure equalization. - **Auditory Nerve**: This nerve transmits auditory information to the brain but does not play a role in pressure equalization. - **Eustachian Tube**: This tube connects the middle ear to the nasopharynx and allows air to flow between these two areas, helping to equalize pressure on both sides of the tympanic membrane. 5. **Conclusion**: The correct answer is the **Eustachian tube**, as it is the structure that opens in the nasopharynx and permits the equalization of air pressure on both sides of the tympanic membrane. ### Final Answer: The structure that opens in the nasopharynx and permits air pressure on both sides of the tympanic membrane to be kept equal is the **Eustachian tube**. ---
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