Q: Which of the following veins does not open in the right atrium of the heart?  

Answer: A

The middle cardiac vein is a vein that runs along the posterior interventricular sulcus on the heart and drains blood from the back of the heart. However, it does not open directly into the right atrium like most veins in the heart. Instead, it empties into the larger coronary sinus, which then opens into the right atrium. The anterior cardiac vein drains the front of the heart and opens directly into the right atrium, while the superior vena cava drains blood from the upper body and also opens into the right atrium. Therefore, the correct answer is option A, the middle cardiac vein, as it does not open directly into the right atrium.

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