Which cranial nerve innervalos organs outside the cephalic region?

Options

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

Answer

To determine which cranial nerve innervates organs outside the cephalic region, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for a cranial nerve that innervates organs outside the cephalic (head) region.

2. **Identify Cranial Nerves**: There are 12 pairs of cranial nerves. We need to consider their functions and the regions they innervate.

3. **List the Options**: The options provided are:
- Trigeminal nerve
- Auditory nerve
- Glossopharyngeal nerve
- Vagus nerve

4. **Analyze Each Option**:
- **Trigeminal Nerve**: Primarily responsible for sensation in the face and motor functions such as biting and chewing. It innervates structures in the cephalic region.
- **Auditory Nerve**: Also known as the vestibulocochlear nerve, it is involved in hearing and balance, and it innervates structures in the ear, which is part of the cephalic region.
- **Glossopharyngeal Nerve**: This nerve innervates the pharynx and parts of the tongue, which are still considered part of the cephalic region.
- **Vagus Nerve**: This nerve extends beyond the head and neck to innervate organs in the thorax and abdomen, including the heart, lungs, and digestive tract.

5. **Conclusion**: The vagus nerve is the cranial nerve that innervates organs outside the cephalic region. Therefore, the answer is the **Vagus Nerve**.

### Final Answer:
The cranial nerve that innervates organs outside the cephalic region is the **Vagus Nerve**.