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. 2016 Apr 5;3(2):11. doi: 10.3390/jcdd3020011

Figure 1.

Figure 1

Cardiac base as seen from the atrial aspect. White star, red borders: the atrioventricular node; Red line: the bundle of His; Green dotted line: the dead-end tract (the continuation of the atrioventricular conduction axis); Yellow dotted line: the retro-aortic ring branch; White dotted line: embryonic atrioventricular ring; Red star, white borders: the retroaortic node; This image was both provided and labelled by Professor Robert H. Anderson and reproduced with his kind permission. Professor Anderson retains his intellectual copyright in the original image.