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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.

Heart Valves

Heart Valves

The human heart is a complex organ with an intricate system of valves that regulate blood flow. There are two main types of valves: atrioventricular (AV) valves and semilunar valves.
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...

Overview of the Heart

Overview of the Heart

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...

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.

Chambers of the Heart

Chambers of the Heart

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.
Deoxygenated blood from the body is received in the right...

Conduction System of the Heart

Conduction System of the Heart

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.
The pacemaker cells are located in two primary nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node pacemaker cells can autonomously depolarize, triggering an action potential that leads to the...

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Related Experiment Video

Updated: Jun 6, 2025

Generating Self-Assembling Human Heart Organoids Derived from Pluripotent Stem Cells

Generating Self-Assembling Human Heart Organoids Derived from Pluripotent Stem Cells

Published on: September 15, 2021

Self-organizing network representation of human heart.

Runsang Liu¹, Hui Yang¹

¹Complex System Monitoring, Modeling, and Control Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.

Chaos (Woodbury, N.Y.)

|December 2, 2024

Summary

This study shows a new method to reconstruct biological geometric structures from network data. This approach helps understand how network data can represent spatial configurations in systems like the human heart.

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Last Updated: Jun 6, 2025

Generating Self-Assembling Human Heart Organoids Derived from Pluripotent Stem Cells

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Published on: September 15, 2021

Developing 3D Organized Human Cardiac Tissue within a Microfluidic Platform

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Author Spotlight: Advancing Human Cardiac Anatomy Through Multi-Scale Analysis of Hearts

Published on: June 28, 2024

Area of Science:

Computational Biology
Network Science
Biophysics

Background:

Biological systems exhibit complex structure-function relationships dependent on both connectivity and spatial geometry.
Network representations often capture connectivity but lose crucial spatial configuration information.
Understanding geometric details is vital for biological systems, such as the human heart.

Purpose of the Study:

To develop a novel self-organizing method for deriving geometric structure from network representations of biological systems.
To investigate the feasibility of using network theory to reconstruct spatial geometry.
To explore applications in understanding disease-altered biological functions.

Main Methods:

Simulating a network as a physical system with nodes as charged particles and edges as springs.
Employing a self-organizing approach where the network evolves to minimize energy.
Allowing random initializations to observe the self-organization process.

Main Results:

The network successfully self-organizes to reconstruct geometric details from its connectivity information.
Despite random starting points, the network converges to a stable topology upon energy minimization.
The study demonstrates that network representations can effectively resemble spatial geometry.

Conclusions:

A novel self-organizing method can derive geometric structure from biological network data.
This approach validates the potential of network theory in representing and understanding spatial configurations in biological systems.
The findings provide a foundation for using network analysis to study disease-related changes in biological functions.