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Anatomy of the Heart

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.

Anatomy of the Heart

Anatomy of the Heart

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...

Development of the Heart

Development of the Heart

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.
As the embryo undergoes lateral folding, these paired tubes approach each other, merging into a single primitive heart...

Layers of the Heart Wall

Layers of the Heart Wall

The heart wall comprises three distinct layers: the epicardium, myocardium, and endocardium. The outermost layer, the epicardium, is the visceral layer of the serous pericardium, featuring a thin, transparent mesothelial surface and an inner layer of areolar connective tissue with fat deposits that increase with age.
The myocardium, the thickest layer, consists of cardiac muscle cells interconnected by intercalated discs and crisscrossing connective tissue fibers. These muscle fibers contract...

Location and Orientation of the Heart

Location and Orientation of the Heart

The human heart, despite its modest size and weight, is an organ of remarkable strength and endurance. Roughly the size of a fist, the heart weighs between 250 and 350 grams and is nestled within the mediastinum, the medial cavity of the thorax. It extends obliquely for about 12 to 14 cm, resting on the superior surface of the diaphragm. The heart is positioned anterior to the vertebral column and posterior to the sternum, with two-thirds of its mass lying to the left of the midsternal line.

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Related Experiment Video

Updated: Mar 22, 2026

Using Chicken Embryo as a Powerful Tool in Assessment of Developmental Cardiotoxicities

Using Chicken Embryo as a Powerful Tool in Assessment of Developmental Cardiotoxicities

Published on: March 21, 2021

Visualization Techniques for the Developing Chicken Heart.

Ly Phan¹, Cindy Grimm², Sandra Rugonyi³

¹Intel Corp., Portland, USA.

Advances in Visual Computing : ... International Symposium, ISVC ... : Proceedings. International Symposium on Visual Computing

|April 30, 2016

Summary

This summary is machine-generated.

This study introduces novel methods to analyze the 4D motion of embryonic chick heart outflow tracts, quantifying shape changes to understand how altered blood flow impacts heart development.

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Area of Science:

Developmental Biology
Cardiovascular Physiology
Biomedical Engineering

Background:

The embryonic chick heart outflow tract (OFT) exhibits complex 4D peristaltic-like motion.
Understanding OFT development is crucial for elucidating congenital heart defects.
Hemodynamic forces significantly influence cardiac development and morphology.

Purpose of the Study:

To develop and apply geometric surface parameterization and visualization techniques for analyzing 4D OFT motion.
To create quantitative measures of temporal heart-shape changes in embryonic chick hearts.
To investigate the impact of altered hemodynamic conditions on OFT shape and motion.

Main Methods:

Geometric surface parameterization algorithm for 4D data.
Visualization techniques tailored for OFT motion analysis.
Comparative analysis of OFT motion in normal and OFT-banded embryonic chick hearts.

Main Results:

Successful quantification of 4D OFT motion under normal and altered hemodynamic conditions.
Demonstration of techniques using data from eight embryonic chick hearts.
Establishment of methods to link hemodynamic changes to OFT wall shape and motion dynamics.

Conclusions:

The developed methods provide quantitative insights into OFT development.
Altered hemodynamic conditions lead to measurable changes in OFT shape and motion.
This research contributes to understanding the mechanical influences on embryonic heart development.