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
