Epicardium Myocardium Endocardium
Epicardium Myocardium Endocardium - Related Videos
01:27
Anatomy of the Heart
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2019
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.
10:33
Local Field Fluorescence Microscopy: Imaging Cellular Signals in Intact Hearts
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Cited by 8 •
2017
In the heart, molecular events coordinate the electrical and contractile function of the organ. A set of local field fluorescence microscopy techniques presented here enables the recording of cellular variables in intact hearts. Identifying mechanisms defining the cardiac function is critical in understanding how the heart works under pathological situations.
07:24
Reduction in Left Ventricular Wall Stress and Improvement in Function in Failing Hearts using Algisyl-LVR
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Cited by 34 •
2013
This article describes procedures for implanting a novel hydrogel in failing hearts and quantifying its effect on left ventricular wall stress and function. These procedures have been successfully applied in dogs and humans.
10:28
An Injectable and Drug-loaded Supramolecular Hydrogel for Local Catheter Injection into the Pig Heart
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Cited by 21 •
2015
Supramolecular hydrogelators based on ureido-pyrimidinones allow full control over the macroscopic gel properties and the sol–gel switching behavior using pH. Here, we present a protocol for formulating and injecting such a supramolecular hydrogelator via a catheter delivery system for local delivery directly in relevant areas in the pig heart.
11:17
A Microscopic 2,3,5-Triphenyltetrazolium Chloride Assay for Accurate and Reliable Analysis of Myocardial Injury
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2025
The present 2,3,5-Triphenyltetrazolium Chloride (TTC) assay introduces a refined TTC staining protocol that enables the analysis of myocardial injury at microscopic resolution, producing high-quality images that allow for accurate and reliable assessment of infarct size and cardiomyocyte viability at the cellular level.
FAQs
The layers support different stages of cardiac performance at the same time. Electrical excitation coordinates myocardial contraction, while the epicardium helps protect the heart’s outer surface and the endocardium maintains a smooth interface with blood inside chambers and valves. Their combined arrangement allows pressure generation and blood movement to occur while reducing mechanical stress and friction.
Pressure depends on the myocardium’s cardiac muscle, which contracts after coordinated electrical excitation. The strength and timing of this contraction determine how effectively the heart can drive blood through its chambers and onward through the circulation. Damage that interferes with myocardial structure or excitation can therefore affect pumping more directly than a change limited to a surface layer.
Protection occurs at two different interfaces. The epicardium contributes an external covering that includes connective and adipose tissues, helping shield the heart’s surface. Inside the chambers, the endocardium provides a smooth endothelial lining across both chambers and valves. This separation of protective and blood-facing roles helps limit friction and mechanical disturbance during repeated cardiac motion.
A useful comparison considers each layer’s position, dominant tissue characteristics, and functional relationship to blood flow or contraction. Connective and adipose tissues distinguish the epicardium, cardiac muscle identifies the myocardium, and endothelial lining characterizes the endocardium. Linking these features to protection, pressure generation, or a smooth blood interface makes microscopic structure biologically meaningful.
The affected layer can provide clues about the type of cardiac problem being considered. Conditions involving the epicardium may relate to protection or outer-surface inflammation, whereas myocardial injury may compromise contraction and pressure generation. Endocardial or valve-associated changes may interfere with the smooth blood-facing surface. This framework helps connect structural damage with altered heart function.
Studying the layers provides a framework for examining cardiac development, congenital abnormalities, inflammation, and ischemic injury. It also helps explain why disease may selectively affect particular heart structures rather than the entire wall equally. In biology and medicine, relating a lesion or abnormality to its layer supports interpretation of changes in cardiac structure, blood flow, and synchronized pumping.