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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.

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...

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...

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...

Mitral Valve Prolapse I: Introduction

Mitral Valve Prolapse I: Introduction

IntroductionThe mitral valve, one of the heart's four valves, regulates blood flow. These valves have flaps that open and close to direct blood properly through the heart and body. During each heartbeat, the flaps open for blood to pass through and seal shut to prevent backflow. Specifically, the mitral valve opens to allow blood flow from the heart's upper left chamber to the lower left chamber. It then closes securely as the lower left chamber contracts to pump blood to the body, preventing...

Mitral Valve Prolapse II: Assessment and Management

Mitral Valve Prolapse II: Assessment and Management

IntroductionA range of clinical features characterizes Mitral Valve Prolapse (MVP), but it is important to note that many individuals with MVP are asymptomatic and may remain so throughout their lives. For those who do exhibit symptoms, the following are the key clinical features:Palpitations: This is a common symptom where individuals feel an irregular or rapid heartbeat. Palpitations in MVP are often due to arrhythmias such as premature ventricular contractions or supraventricular tachycardia.

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Related Experiment Video

Updated: Jul 5, 2026

Echocardiographic Approaches and Protocols for Comprehensive Phenotypic Characterization of Valvular Heart Disease in Mice

Echocardiographic Approaches and Protocols for Comprehensive Phenotypic Characterization of Valvular Heart Disease in Mice

Published on: February 14, 2017

Is tricuspid valve really tricuspid?

Sunita Athavale¹, Rashmi Deopujari², Urmila Sinha³

¹Department of Anatomy, All India Institute of Medical Sciences, Bhopal, India.

Anatomy & Cell Biology

|April 19, 2017

Summary

The tricuspid valve anatomy is complex, rarely having three leaflets as commonly assumed. This study reveals unique leaflet morphology impacting valve function and clinical interpretations in cardiology.

Keywords:

Annulus Commissure Leaflet Scallop

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Layer Microdissection of Tricuspid Valve Leaflets for Biaxial Mechanical Characterization and Microstructural Quantification

Layer Microdissection of Tricuspid Valve Leaflets for Biaxial Mechanical Characterization and Microstructural Quantification

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Last Updated: Jul 5, 2026

Echocardiographic Approaches and Protocols for Comprehensive Phenotypic Characterization of Valvular Heart Disease in Mice

Echocardiographic Approaches and Protocols for Comprehensive Phenotypic Characterization of Valvular Heart Disease in Mice

Published on: February 14, 2017

Biaxial Mechanical Characterizations of Atrioventricular Heart Valves

Biaxial Mechanical Characterizations of Atrioventricular Heart Valves

Published on: April 9, 2019

Layer Microdissection of Tricuspid Valve Leaflets for Biaxial Mechanical Characterization and Microstructural Quantification

Layer Microdissection of Tricuspid Valve Leaflets for Biaxial Mechanical Characterization and Microstructural Quantification

Published on: February 10, 2022

Area of Science:

Anatomy
Cardiology
Medical Imaging

Background:

Advancements in cardiac imaging and interventional cardiology highlight the need for detailed tricuspid valve complex anatomy.
Understanding tricuspid valve morphology is crucial for accurate image interpretation and procedural success.

Purpose of the Study:

To objectively characterize the morphology of tricuspid valve leaflets.
To define new criteria for assessing leaflet structure and variations.

Main Methods:

Examination of 36 embalmed human cadaveric hearts.
Application of newly defined criteria to delineate leaflet morphology, commissural zones, and scallops.

Main Results:

The study observed variations in leaflet count: single (6/36), double (26/36), and triple (4/36).
Anterior and septal leaflets frequently incorporate portions of the inferior leaflet, which rarely exists independently.
A wide, un-indented basal zone was consistently identified across all leaflets.

Conclusions:

The tricuspid valve anatomy is highly variable and rarely conforms to a typical three-leaflet structure.
A wide basal zone may impede complete valve opening, while leaflet incongruence could hinder complete closure, potentially explaining functional tricuspid regurgitation.
Findings enhance understanding for imaging specialists and cardiologists, aiding in diagnosis and intervention for tricuspid valve conditions.