Heart Layers
Heart Layers - Related Videos
01:15
Layers of the Heart Wall
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2025
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...
07:27
Implantation of Total Artificial Heart in Congenital Heart Disease
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Cited by 40 •
2014
This is a case report of a patient with congenitally corrected transposition of the great arteries (CCTGA) who received a total artificial heart (TAH) as a bridge to heart transplant. The TAH was successfully implanted with modifications to accommodate the patient's congenitally malformed heart.
07:47
A Novel Ex vivo Culture Method for the Embryonic Mouse Heart
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Cited by 12 •
2013
Developmental studies in the mouse are hampered by the inaccessibility of the embryo during gestation. To promote the long-term culture of the embryonic heart at late stages of gestation, we developed a protocol in which the excised heart is cultured in a semi-solid, dilute Matrigel.
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.
03:07
Thin-Layer Chromatography - Concepts
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2020
Chromatography Chromatography is a technique used in organic chemistry to separate compounds in a mixture based on their differences in solubility between two different phases. The concept is similar to liquid-liquid extraction, except in chromatography, the two phases consist of the stationary phase and the mobile phase. The stationary phase is a solid — typically a microscale hydrogel bead — while the mobile phase is a carrier solvent. In traditional chromatography, the stationary phase is...
FAQs
The myocardium supplies the heart’s contractile force. When its muscle fibers contract in a coordinated manner, pressure develops within the chambers and drives blood movement through the circulation. This makes myocardial organization central to cardiac function, because impaired contraction can reduce pressure generation and alter the effectiveness of overall blood flow.
Pericardial fluid allows the heart to move with reduced friction inside its surrounding protective sac. This lubrication supports repeated beating while the heart changes shape during contraction. Examining this relationship helps explain how the outer coverings contribute not only protection, but also mechanical conditions that permit efficient cardiac motion.
Layer-specific changes can disrupt circulation through different structural or mechanical pathways. Inflammation may alter the tissues surrounding or forming the heart, ischemia may compromise the myocardium’s contractile performance, and wall defects may disturb chamber function. Relating the affected layer to these outcomes helps connect cardiac structure with altered blood movement.
Imaging can use the organized arrangement of the endocardium, myocardium, epicardium, and pericardium as anatomical reference points. Distinguishing these regions helps investigators and clinicians relate visible structural changes to the heart wall or its surrounding sac. This layered framework supports interpretation of findings rather than treating the heart as a single uniform structure.
Layer identification provides a structural map for evaluating abnormalities and planning interventions. Clinicians can relate inflammation, ischemia, or wall defects to the tissue region involved, while surgical approaches can use the same anatomical organization to target the relevant cardiac area. The result is a clearer connection between observed pathology, location, and cardiac function.
Heart layers give researchers a framework for studying how cardiac structure supports circulation and how disease alters that relationship. Experiments and observations can focus on contractile myocardial function, inner or outer heart-wall regions, or the protective pericardial environment. This organization also helps interpret imaging findings and investigate structural targets relevant to cardiovascular disease.