Which of the following structures ultimately drains, deoxygenated blood fro heart musculature through coronary vein into right atrium?

Options

A. Superior vena cava
B. Inferior vena cava
C. Coronary sinus
D. Coronary arteries

Answer

To solve the question regarding which structure ultimately drains deoxygenated blood from the heart musculature through the coronary vein into the right atrium, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking for the structure that drains deoxygenated blood from the heart muscle (myocardium) into the right atrium via the coronary vein.

2. **Identify the Options**: The options provided are:
- A) Superior Vena Cava
- B) Inferior Vena Cava
- C) Coronary Sinus
- D) Coronary Arteries

3. **Evaluate Each Option**:
- **A) Superior Vena Cava**: This vessel carries deoxygenated blood from the upper body to the right atrium but does not drain blood from the heart muscle itself. So, this is not the correct answer.
- **B) Inferior Vena Cava**: Similar to the superior vena cava, this vessel carries deoxygenated blood from the lower body to the right atrium and does not drain blood from the heart muscle. Thus, this is also incorrect.
- **C) Coronary Sinus**: The coronary sinus is a large vein that collects deoxygenated blood from the heart muscle (myocardium) and drains it directly into the right atrium. This is the correct answer.
- **D) Coronary Arteries**: These arteries supply oxygenated blood to the heart muscle, not deoxygenated blood. Therefore, this option is not correct.

4. **Conclusion**: Based on the evaluation, the structure that ultimately drains deoxygenated blood from the heart musculature through the coronary vein into the right atrium is the **Coronary Sinus**.

### Final Answer:
**C) Coronary Sinus**