Which of the following is not under the control of vagus nerve ?

Options

A. Gastrointestinal movement
B. Respiratory movement
C. Salivation
D. Heart beat

Answer

To solve the question "Which of the following is not under the control of the vagus nerve?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Vagus Nerve**:
- The vagus nerve is the 10th cranial nerve and is part of the parasympathetic nervous system. It plays a crucial role in controlling various involuntary bodily functions.

2. **Identify Functions of the Vagus Nerve**:
- The vagus nerve is involved in controlling the heart rate, gastrointestinal tract movements, and respiratory functions. It also has a role in regulating the digestive system.

3. **Analyze the Options**:
- We need to evaluate each option to determine whether it is controlled by the vagus nerve or not.

4. **Option Evaluation**:
- **Option 1: Gastrointestinal Movement**: This is controlled by the vagus nerve as it regulates the digestive tract. (Incorrect option)
- **Option 2: Respiratory Movement**: The vagus nerve also influences respiratory functions as it innervates the lungs. (Incorrect option)
- **Option 3: Salivation**: This function is primarily controlled by the autonomic nervous system, specifically the facial nerve (cranial nerve VII) and glossopharyngeal nerve (cranial nerve IX), not the vagus nerve. (Correct option)
- **Option 4: Control of Adrenal Medulla**: The vagus nerve does not directly control the adrenal medulla; however, it is involved in the autonomic nervous system's overall regulation. (Incorrect option)

5. **Conclusion**:
- Based on the evaluation, the correct answer to the question is **Option 3: Salivation**, as it is not under the control of the vagus nerve.