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Anatomy of the Heart01:27

Anatomy of the Heart

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: Jun 23, 2026

3D Whole-heart Myocardial Tissue Analysis
06:53

3D Whole-heart Myocardial Tissue Analysis

Published on: April 12, 2017

8.7K

Heart Scar-In-A-Dish: Tissue Culture Platform to Study Myocardial Infarct Healing In Vitro.

M J Potter1, J D Heywood2, S J Coeyman1

  • 1Ralph E. Martin Department of Chemical Engineering, University of Arkansas, Fayetteville, AR, USA.

Biorxiv : the Preprint Server for Biology
|March 10, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a new 3D engineered heart tissue model that mimics the mechanical stresses of myocardial infarction (MI). This platform helps researchers better understand heart tissue repair and test new therapies for heart attack recovery.

Keywords:
engineered heart tissuefibrosismechanobiologymyocardial infarct

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Last Updated: Jun 23, 2026

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Research
  • Tissue Engineering

Background:

  • Myocardial Infarction (MI) causes significant mortality and morbidity, with cardiac remodeling heavily influencing patient outcomes.
  • Current engineered heart tissues (EHTs) often fail to replicate the complex, heterogeneous microarchitecture and mechanical environment of infarcted myocardium.
  • The post-MI heart exhibits distinct zones (infarct, border, remote) with varying cellular composition and mechanical properties.

Purpose of the Study:

  • To develop and validate a novel in vitro 3D tissue culture platform that accurately mimics the heterogeneous mechanical environment of post-infarct myocardium.
  • To enable accelerated in vitro therapy screening for improving infarct healing.
  • To provide a tool for characterizing myocardial wound remodeling with spatial and temporal resolution.

Main Methods:

  • Engineered heart tissues (EHTs) composed of neonatal rat cardiomyocytes and cardiac fibroblasts were created.
  • A cryowound injury was induced in the central portion of beating EHTs to simulate localized cell death.
  • Mechanical properties (strains and stiffness) of different tissue zones (wounded, border, remote) were analyzed post-injury.

Main Results:

  • The engineered platform successfully replicated the heterogeneous mechanical environment: the remote zone contracted, while the wounded zone experienced tensile stretching.
  • Increased tissue stiffness was observed in the wounded and border zones following injury, unlike the remote zone.
  • The model demonstrated spatial and temporal resolution in characterizing myocardial wound remodeling.

Conclusions:

  • This novel in vitro platform accurately recapitulates the mechanical heterogeneity of post-myocardial infarction myocardium.
  • The platform offers a valuable tool for studying myocardial wound healing and for screening potential therapeutic interventions.
  • Findings contribute to a deeper understanding of myocardial infarction pathophysiology and potential treatment strategies.