What is the embryology of pediatric right bundle branch block?

Updated: Jul 26, 2018
  • Author: Glenn T Wetzel, MD, PhD; Chief Editor: Syamasundar Rao Patnana, MD  more...
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The cardiac conduction system develops from rings of specialized tissue found in the embryonic heart tube. One theory describes four rings, each located between different segments of the heart tube. With looping and growth of the cardiac septi, the rings are brought together and develop into the sinus node, the AV node, and the penetrating bundle. Another theory describes a single ring of tissue located between the bulbus cordis and the primitive ventricle, which gives rise to the AV node, His bundle, right bundle branch, and left bundle branch.

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