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from Latin: inter - between, nodus - node

Definition

The term internodal tract refers to three fibre bundles of the atrial myocardium that run from the sinus node to the atrioventricular node.

Background

The existence of internodal bundles has been debated for several decades, as their course cannot be distinctly identified histologically, and the cardiomyocytes within these supposed bundles do not differ significantly from the surrounding atrial myocardium. Recent literature (2021) suggests that internodal bundles may not actually exist in the human atrium.[1]

Classification

Three internodal bundles are traditionally distinguished:

  • Anterior internodal bundle (Bachmann-James bundle)
  • Middle internodal bundle (Wenckebach bundle)
  • Posterior internodal bundle (Thorel bundle)

Additionally, the interatrial bundle (Bachmann bundle) branches off from the anterior internodal bundle and runs to the left atrium.

Function

The internodal bundles are proposed to be part of the heart's conduction system, conducting electrical impulses from the sinus node across the right atrial wall to the AV node.

Sources

  1. ↑ Eduardo Back Sternick, Damián Sánchez-Quintana: Critical Assessment of the Concepts and Misconceptions of the Cardiac Conduction System over the Last 100 Years: The Personal Quest of Robert H. Anderson. Journal of Cardiovascular Development and Disease, January 2021