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Development of the atrioventricular junctional area in the human heart

D Kozłowski1, M Grzybiak, A Owerczuk

  • 12nd Department of Cardiac Diseases, Medical University, ul. Kieturakisa 1, 80-742 Gdańsk, Poland. dkozl@amedec.amg.gda.pl

Folia Morphologica
|March 10, 2001
PubMed

Insights

The atrioventricular junction, a key part of the heart

Area of Science:

  • Cardiovascular Anatomy
  • Cardiac Electrophysiology
  • Histology

Background:

  • The heart's conduction system, including the atrioventricular (a-v) node, has historical significance.
  • Despite early descriptions, a comprehensive understanding of the a-v junction's detailed structure remains incomplete.
  • Invasive cardiologists rely on this system, highlighting the need for precise anatomical knowledge.

Purpose of the Study:

  • To conduct a detailed histological evaluation of the morphology and topography of the atrioventricular junction.
  • To clarify the anatomical characteristics of the a-v junction in normal human hearts across a wide age range.
  • To provide a foundational understanding for interventional electrophysiology procedures.

Main Methods:

  • Autopsy of 100 normal human hearts (fetal to 105 years).
  • Histological examination of heart septum sections.
  • Staining using Masson's trichrome method with Goldner's modification.

Main Results:

  • The atrioventricular junction is a stable structure present in all hearts, showing age-related involutionary changes.
  • Two main components were identified: the atrioventricular node and the atrioventricular bundle.
  • The atrioventricular node comprises three zones (prenodal, perinodal, main) with distinct cellular structures and positions.
  • The atrioventricular bundle has a stable structure (penetrating, non-branching, branching) and topography, located in the membranous septum.

Conclusions:

  • The atrioventricular junction is a consistent anatomical entity with age-dependent modifications.
  • Detailed knowledge of the atrioventricular node and bundle morphology and topography is crucial for cardiac electrophysiology.
  • This study provides essential anatomical data for understanding and improving interventional cardiac procedures.

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