Which of the following structures ultimately drains, deoxygenated blood from 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, we need to identify which structure is responsible for draining deoxygenated blood from the heart musculature into the right atrium. Here’s the step-by-step solution:

### Step 1: Understand the Question
The question asks about the structure that drains deoxygenated blood from the heart muscle (myocardium) through the coronary vein into the right atrium.

### Step 2: Identify the Options
The options provided are:
1. Superior Vena Cava
2. Inferior Vena Cava
3. Coronary Sinus
4. Coronary Arteries

### Step 3: Analyze Each Option
- **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.

- **Inferior Vena Cava**: Similar to the superior vena cava, this vessel carries deoxygenated blood from the lower body to the right atrium but not from the heart muscle.

- **Coronary Sinus**: This structure collects deoxygenated blood from the coronary veins, which drain the heart muscle, and empties it into the right atrium. This is the correct answer.

- **Coronary Arteries**: These arteries supply oxygenated blood to the heart muscle, not drain it.

### Step 4: Conclusion
Based on the analysis, 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
The correct answer is **Coronary Sinus** (Option C).

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