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Right Coronary Artery

Author: RxPG, Posted on Friday, October 22 @ 10:09:45 IST by RxPG  

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Anatomy

The right coronary artery supplies all of the following parts of the conducting system in the heart except:
1.SA Node.
2.AV Node.
3.AV Bundle.
4.Right bundle branch.


Answer
1.SA Node.

4.Right bundle branch.

Reference
Gray's Anatomy 38th Edition Page 1510

Fundamentals of Human Anatomy (Regional and Applied) Dr.A.S.Moni - Vol II - Page 37

Snell’s Clinical Anatomy 6th Edition Page 105

BDC Page 226

Quality
Confusa !!!

Status
High Yield Topic - Arteries

QTDF
Any Anatomy book (and each give their own Answers)

Discussion
Fundamentals of Human Anatomy by Dr.Moni gives the Branches of Right Coronary Artery as follows

1. Branch to SA Node

2. Marginal Artery supplies the anterior and Posterior surfaces of Right Ventricle

3. AV Nodal Artery supplies the AV Node and its Right Branch

4. Post IV Branch – supplies the post 1/3 of IV Septum and the posterior surface of Right and Left Ventricle

5. Branches to Right Atrium

6. Vasavasorum to the Ascending Aorta

The same views are shared by BDC who says that RCA supplies the whole of conducting System of heart except Left Bundle. Then the Answer will be 1.SA Node, which has dual supply

But Snell says that the conducting system is supplied like this


SA Node


supplied by


RCA,


LCA


AV Node


supplied by


RCA,




Bundle


supplied by


RCA,




Right Branch


supplied by




LCA


Left Branch


supplied by


RCA


LCA

So according to Snell, the Answer is 4.Right bundle branch.

Explanation

  1. SA Node is supplied by the Branch to SA Node. And it has dual supply

  2. AV Node is supplied by the AV Nodal Artery from RCA

  3. AV Bundle is supplied by the Right Coronary Artery(BDC) as well as by LCA(Snell)

  4. Right bundle branch is supplied by the AV Nodal Artery


Comments
Anatomy of the Heart is a High Yield Topic. Arteries and Veins are another High Yield Topic and there is no wonder that we got a theme couple for this topic in AIPG 2003

Tips
Read the Blood supply of areas of Brain, especially the internal capsule !!
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