Which of the following cranial is found only in amniotes ?

Options

A. Vagus
B. Trigeminal
C. Hypoglossal
D. Glossopharyngeal

Answer

To solve the question "Which of the following cranial nerves is found only in amniotes?" we will follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks us to identify which cranial nerve is exclusive to amniotes. Amniotes are a group of tetrapod vertebrates that include reptiles, birds, and mammals.

2. **Identifying the Options**: The options given are:
- A) Vagus
- B) Trigeminal
- C) Hypoglossal
- D) Glossopharyngeal

3. **Reviewing Cranial Nerves**:
- **Vagus Nerve**: This is the tenth cranial nerve and is present in both amniotes and non-amniotes.
- **Trigeminal Nerve**: This is the fifth cranial nerve and is also found in both amniotes and non-amniotes.
- **Hypoglossal Nerve**: This is the twelfth cranial nerve and is specifically found in amniotes.
- **Glossopharyngeal Nerve**: This is the ninth cranial nerve and is present in both amniotes and non-amniotes.

4. **Identifying the Unique Nerve**: From the analysis, the hypoglossal nerve is the only cranial nerve listed that is found exclusively in amniotes.

5. **Conclusion**: Therefore, the correct answer to the question is C) Hypoglossal.

### Final Answer:
C) Hypoglossal

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