Vestibule is constituted by

Options

A. Semicircular canals and utriculus
B. Sacculus and utriculus
C. Sacculus and ampullae
D. Ampullae and lagena.

Answer

To answer the question "Vestibule is constituted by," we need to analyze the options provided and understand the anatomy of the vestibule in the inner ear.

### Step-by-Step Solution:

1. **Understanding the Vestibule**:
- The vestibule is a part of the inner ear, which plays a crucial role in balance and spatial orientation. It is located between the cochlea and the semicircular canals.

2. **Identifying Components of the Vestibule**:
- The vestibule contains two important structures known as the **utricle** and the **saccule**. These structures are involved in detecting linear acceleration and changes in head position relative to gravity.

3. **Evaluating the Options**:
- **Option 1**: Semicircular canals and utriculus - Incorrect. The semicircular canals are not part of the vestibule; they are separate structures involved in rotational movement.
- **Option 2**: Sacculus and utriculus - Correct. This option accurately describes the components of the vestibule.
- **Option 3**: Sacculus and ampullae - Incorrect. The ampullae are associated with the semicircular canals, not the vestibule.
- **Option 4**: Ampullae and lagana - Incorrect. This option does not relate to the vestibule.

4. **Conclusion**:
- Based on the analysis, the vestibule is constituted by the **saccule and utricle**.

### Final Answer:
The vestibule is constituted by the **saccule and utricle**.

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