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Related Concept Videos

Chambers of the Heart01:16

Chambers of the Heart

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The human heart is a complex organ made up of four chambers: the right and left atria and the right and left ventricles. These internal chambers are separated by partitions known as the interatrial and interventricular septa. The exterior of the heart features a groove known as the coronary sulcus that demarcates the atria from the ventricles, while the anterior and posterior interventricular sulci distinguish between the two ventricles.
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Development of the Heart01:27

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The development of the human heart, a crucial organ, commences from the mesoderm on the 18th or 19th day after fertilization. This process initiates in the cardiogenic area, a group of mesodermal cells at the embryo's head end, which evolves into elongated strands known as cardiogenic cords. These cords undergo a transformation to form hollow-centered endocardial tubes.
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Anatomy of the Heart01:27

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The human heart is made up of three layers of tissue that are surrounded by the pericardium, a membrane that protects and confines the heart. The outermost layer, closest to the pericardium, is the epicardium. The pericardial cavity separates the pericardium from the epicardium. Beneath the epicardium is the myocardium, the middle layer, and the endocardium, the innermost layer. There are four chambers of the heart: the right atrium, the right ventricle, the left atrium, and the left ventricle.
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Related Experiment Video

Updated: Jan 10, 2026

Analysis of Cardiac Chamber Development During Mouse Embryogenesis Using Whole Mount Epifluorescence
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Recent insights into atrial chamber formation.

Marga Albu1, David Sedmera2, Didier Y R Stainier1

  • 1Max Planck Institute for Heart and Lung Research, Department of Developmental Genetics, Bad Nauheim, Germany.

Seminars in Cell & Developmental Biology
|November 20, 2025
PubMed
Summary
This summary is machine-generated.

Understanding atrial inner wall development is key for treating heart rhythm disorders. Recent findings reveal how these structures form, offering insights for congenital heart defect therapies.

Keywords:
AtriumDevelopmentEvolutionMorphogenesis

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Area of Science:

  • Cardiovascular Biology
  • Developmental Biology
  • Cardiac Electrophysiology

Background:

  • The sinus node initiates heartbeats, with electrical impulses transmitted via atrial inner muscle bundles.
  • Congenital atrial wall defects can disrupt heart rhythm, increasing arrhythmia risk.
  • Understanding atrial inner wall development is crucial for therapeutic strategies.

Purpose of the Study:

  • To review recent findings on atrial inner wall development.
  • To compare atrial and ventricular wall development.
  • To contextualize atrial development within evolutionary patterns.

Main Methods:

  • Review of recent scientific literature on atrial and ventricular development.
  • Comparative analysis of atrial wall architecture across species.
  • Discussion of cellular and molecular mechanisms involved in inner wall formation.

Main Results:

  • Atrial wall architecture varies significantly across species, from web-like in fish to hierarchical in mammals.
  • Oriented action potential propagation correlates with inner muscle bundle formation in chick atria.
  • Zebrafish studies show cardiomyocyte elongation and intercalation form multilayered atrial structures.
  • Cellular/molecular mechanisms of atrial and ventricular inner wall development differ.

Conclusions:

  • The complexity of the atrial inner wall is critical for cardiac function.
  • Investigating atrial morphogenesis and species-specific development is essential.
  • Findings support future research into chamber-specific therapies for congenital heart defects.