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Related Concept Videos

Development of the Heart01:27

Development of the Heart

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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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Anatomy of the Heart01:20

Anatomy of the Heart

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The heart is a hollow, muscular organ approximately the size of a fist, consisting of four chambers. It is enclosed in the pericardium, a fibrous sac with two layers: the visceral and parietal pericardium, separated by a fluid-filled space containing serous fluid to reduce friction.
The heart has three layers: the innermost endocardium, the muscular myocardium, and the outer epicardium, all working together for optimal cardiac function.
Chambers of the Heart
The heart is made up of four...
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Overview of the Heart01:07

Overview of the Heart

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The heart, a muscular organ located in the chest, functions as the body's pump, circulating blood through the vascular system. It has four chambers: two atria on top and two ventricles below. The right atrium receives deoxygenated blood from the body and passes it to the right ventricle, which pumps it to the lungs for oxygenation. The left atrium receives oxygenated blood from the lungs and transfers it to the left ventricle, which pumps it to the rest of the body.
The heart's structure...
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Conduction System of the Heart01:19

Conduction System of the Heart

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Autorhythmicity is a term that refers to the heart's inherent ability to generate electrical signals and instigate muscle contractions. This self-regulating conduction system within the heart consists of two key components: the pacemaker cells and specialized conducting cells.
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Conduction System of the Heart01:20

Conduction System of the Heart

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The cardiac conduction system produces and transmits electrical impulses that prompt myocardial contraction, ensuring efficient heart function. This intricate system ensures that the heart beats in a coordinated and efficient manner, beginning with the atria and then the ventricles. The conduction system optimizes cardiac output by maintaining this precise sequence, which is crucial for adequate blood circulation.
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Related Experiment Video

Updated: Jan 20, 2026

In Vitro Culture of Epicardial Cells From Mouse Embryonic Heart
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Epicardium in Heart Development.

Yingxi Cao1, Sierra Duca1, Jingli Cao1

  • 1Cardiovascular Research Institute, Department of Cell and Developmental Biology, Weill Cornell Medical College, Cornell University, New York, New York 10021, USA.

Cold Spring Harbor Perspectives in Biology
|August 28, 2019
PubMed
Summary
This summary is machine-generated.

The epicardium, essential for heart development and repair, originates from the proepicardial organ (PE). This review explores epicardial roles in lineage specification and differentiation across species.

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Area of Science:

  • Cardiovascular Biology
  • Developmental Biology
  • Regenerative Medicine

Background:

  • The epicardium is the heart's outer layer, vital for cardiac development and regeneration.
  • It originates from the proepicardial organ (PE), a transient embryonic cell cluster.
  • Epicardial cells exhibit high plasticity, contributing to heart formation and repair as progenitor cells and signaling hubs.

Purpose of the Study:

  • To review current knowledge on epicardial biology.
  • To explore cross-species epicardial involvement in cardiac development.
  • To elucidate epicardial roles in lineage specification and differentiation.

Main Methods:

  • Literature review of existing research on epicardial biology.
  • Comparative analysis of epicardial function across different vertebrate species.
  • Synthesis of data on epicardial lineage specification and differentiation.

Main Results:

  • The epicardium is crucial for cardiac development and regeneration.
  • Epicardial cells originate from the proepicardial organ (PE).
  • Cross-species comparisons reveal conserved roles in lineage specification and differentiation.

Conclusions:

  • Understanding epicardial biology is key to advancing cardiac development and repair strategies.
  • Further research into epicardial lineage and differentiation will enhance regenerative medicine approaches.
  • The epicardium's role as a signaling hub and progenitor source is critical for cardiac health.