Question
The right coronary artery arises from which structure?
| A. |
Right Aortic Sinus |
| B. |
Left Aortic Sinus |
| C. |
Posterior Coronary Sinus |
| D. |
Anterior Coronary Sinus |
Show Answer
|
Correct Answer » D Explanation |
 |
There are three aortic sinuses (Sinuses of Valsalva):
- Anterior Aortic Sinus → gives rise to the Right Coronary Artery (RCA)
- Left Posterior Aortic Sinus → gives rise to the Left Coronary Artery (LCA)
- Right Posterior Aortic Sinus → Non-coronary sinus (no coronary artery arises)
In many anatomy textbooks (e.g., BD Chaurasia, Gray’s Anatomy descriptions of the aortic root), the sinuses are named according to their position:
| Aortic Sinus | Artery Arising |
|---|---|
| Anterior Aortic Sinus | Right Coronary Artery |
| Left Posterior Aortic Sinus | Left Coronary Artery |
| Right Posterior Aortic Sinus | No artery |
Therefore:
- RCA → Anterior Aortic Sinus
- LCA → Left Posterior Aortic Sinus
- Non-coronary sinus → Right Posterior Aortic Sinus