Which part of the human ear plays no role in hearing as such but is otherwise very much required ?

Options

A. Organ of corti
B. Vestibular apparatus
C. Ear ossicles
D. Eustachian tube

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which part of the human ear does not contribute to hearing but is still essential for the body.

2. **Identifying Ear Parts**: The human ear consists of several parts: the outer ear (pinna), middle ear (ossicles), inner ear (cochlea and vestibular apparatus), and the Eustachian tube.

3. **Analyzing Each Part**:
- **Organ of Corti**: This is located in the cochlea and is responsible for converting sound vibrations into neural signals. Therefore, it plays a crucial role in hearing.
- **Vestibular Apparatus**: This structure is located in the inner ear and is responsible for balance and spatial orientation. It does not play a direct role in hearing.
- **Ear Ossicles**: These are tiny bones in the middle ear (malleus, incus, stapes) that transmit sound vibrations from the eardrum to the inner ear. They are essential for hearing.
- **Eustachian Tube**: This tube connects the middle ear to the throat and helps equalize pressure in the ear. While it supports hearing indirectly, it is not directly involved in the auditory process.

4. **Conclusion**: Among the parts analyzed, the vestibular apparatus is the one that does not contribute to hearing but is essential for balance and maintaining posture.

5. **Final Answer**: The part of the human ear that plays no role in hearing but is otherwise very much required is the **vestibular apparatus**.

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