Bundle of His originates from` :-`

Options

A. Sinu-auricular node
B. Auriculo-ventricular node
C. Pulmonary aorta
D. Systemic aorta

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the origin of the Bundle of His, a crucial structure in the heart's conduction system.

2. **Identifying the Bundle of His**: The Bundle of His is a collection of heart muscle cells (or fibers) that transmits electrical impulses from the atria to the ventricles, facilitating coordinated heart contractions.

3. **Locating the Origin**: The Bundle of His originates from the Atrioventricular (AV) node, which is also referred to as the Auriculoventricular node.

4. **Evaluating the Options**:
- **Option 1**: Sinoatrial (SA) node - This is the natural pacemaker of the heart but does not give rise to the Bundle of His.
- **Option 2**: Auriculoventricular (AV) node - This is the correct answer as it is the origin of the Bundle of His.
- **Option 3**: Pulmonary aorta - This is a blood vessel and not related to the origin of the Bundle of His.
- **Option 4**: Systemic aorta - Similar to the pulmonary aorta, this is also a blood vessel and not related to the Bundle of His.

5. **Conclusion**: Based on the evaluation, the correct option is **Option 2: Auriculoventricular node**.

### Final Answer:
The Bundle of His originates from the **Auriculoventricular (AV) node**.

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