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electrical CONDUCTION OF HEART

Image source and courtesy http://www.heart-consult.com

Answer

I am afraid the 4th response is closer to truth .Readers may share their thoughts. If there are three distinct pathways   spreading widely connecting the two spacious chambers and   converging again with  precision at the compact  AV node , it  is a  marvel .

Further , If these pathways are real ,  we must  experience different types of  inter nodal re-entrant  tachycardias.Of-course ,we do come across few macro re-entrant tachycardia in the form of atypical atrial flutters  They need a close  watch .Tracking these arrhythmia may throw light on existence of these pathways.

However, the presence of nodal approaches  with preferential inputs to AV node from different parts of atria would indeed  suggest existence of such pathways !

Further study

What does  sophisticated carto and other electro anatomic mapping say about these inter nodal pathways ?

Reference
An excellent article from imperial college London
Atrial anatomy and inter nodal pathway thorel bachman wenkeback

Heterogeneous three-dimensional anatomical and electrophysiological model of human atria . Seemann G, Höper C, Sachse FB, et al. Institute of Biomedical Engineering, University Karlsruhe (TH), Kaiserstrasse 12, 76128 Karlsruhe, Germany. Transact A Math Phys Eng Sci 2006 Jun 15; 364(1843) :1465-81.

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