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The trabecular muscle, or trabeculae carneae, is a significant component of the human heart, making up 12-17% of ventricular mass in normal adult hearts. These are rounded or irregular muscular columns that project from the inner surface of the right and left ventricles. They are involved in maintaining cardiac performance by increasing contractility and stroke work, as well as contributing to intraventricular conduction and cardiac electrophysiology. The contraction of the trabeculae carneae pulls on the chordae tendineae, preventing the inversion of mitral and tricuspid valves, and thus preventing backflow of blood from the ventricles into the atria.
| Characteristics | Values |
|---|---|
| Definition | Trabeculae carneae are rounded or irregular muscular columns that project from the inner surface of the right and left ventricles of the heart. |
| Types | There are three types of trabeculae carneae: those that are attached along their entire length on one side and form prominent ridges; those that are fixed at their extremities but free in the middle; and those that are continuous by their bases with the wall of the ventricle, with their apices giving origin to the chordae tendineae. |
| Function | Trabeculae carneae aid in the flow of blood by preventing the suction that would occur if the internal surfaces of the ventricular wall were smooth. They also help to maintain cardiac performance in both healthy and failing hearts by increasing contractility and stroke work. |
| Development | Trabeculae carneae are among the first cardiac structures to develop in the embryonic cardiac tube. During development, some trabeculae carneae condense to form the myocardium, papillary muscles, chordae tendineae, and septum. |
| Volume | Trabeculae carneae and papillary muscles make up 12-17% of ventricular mass in normal human adult hearts. |
| Clinical Considerations | Hypertrabeculation has been associated with adverse cardiovascular events. Diagnosis of certain conditions related to trabeculae may require the use of imaging techniques such as short-axis cine cardiovascular magnetic resonance (CMR) or color Doppler. |
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What You'll Learn
Trabecular muscle and cardiac performance
The trabecular muscle, or trabeculae carneae, are rounded or irregular muscular columns that project from the inner surface of the right and left ventricles of the heart. They are different from the pectinate muscles, which are present in the atria of the heart. The trabeculae carneae are highly varied in appearance but are deeper and more complex within the left ventricle. The trabeculae carneae and the papillary muscles make up a significant percentage of the ventricular mass in the heart (12-17% in normal human adult hearts).
The trabeculae carneae play an important role in maintaining cardiac performance. Their contraction pulls on the chordae tendineae, preventing inversion of the mitral and tricuspid valves and controlling the flow of blood into the heart. This action on the atrioventricular valves prevents backflow of blood from the ventricles into the atria. The trabeculae carneae also increase contractility and stroke work, contributing to improved cardiac performance. Additionally, their fractal branching pattern and complex structures suggest involvement in cardiac electrophysiology and mechanical function.
The trabeculae carneae have different types and variations. Some are attached along their entire length on one side, forming prominent ridges. Others are fixed at their ends but free in the middle, such as the moderator band in the right ventricle. A third type, the musculi papillares, are continuous with the ventricular wall and give rise to the chordae tendineae. The chordae tendineae connect to the cusps of the tricuspid valve, ensuring proper valve function.
The trabeculae carneae are among the first cardiac structures to develop in the embryonic cardiac tube. During development, some trabeculae carneae condense to form the myocardium, papillary muscles, chordae tendineae, and septum. The trabeculae network is profuse in some species, leading to the term "spongy myocardium" due to its sponge-like appearance. This network directs blood flow within the ventricles and increases force generation by providing a larger cross-sectional area.
In summary, the trabecular muscle, or trabeculae carneae, plays a crucial role in maintaining cardiac performance by controlling blood flow, preventing valve inversion, and improving contractility. Its complex structure and function contribute to the efficient operation of the heart, making it an important component of cardiovascular physiology.
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Trabecular muscle and ventricular volume
The trabeculae carneae are rounded or irregular muscular columns that project from the inner surface of the right and left ventricles of the heart. They are among the first cardiac structures to develop in the embryonic cardiac tube. Some trabeculae carneae condense to form the myocardium, papillary muscles, chordae tendineae, and septum. They are different from the pectinate muscles, which are present in the atria of the heart.
The trabeculae carneae and the papillary muscles make up a significant percentage of the ventricular mass in the heart (12-17% in normal human adult hearts). They are correlated with ventricular end-diastolic volume. The trabeculae ratios of capillary-to-myocyte differ between the walls of the right and left ventricles. In the left ventricle, each capillary delivers oxygen to one myocyte. However, in the right ventricle, the capillary-to-myocyte ratio is 0.8 because the right ventricle tissues have a lower oxygen consumption due to a weaker afterload.
The trabeculae carneae play an important role in maintaining cardiac performance in both healthy and failing hearts. Their fractal branching pattern helps to increase contractility and stroke work. Additionally, trabecular morphology is crucial for intraventricular conduction, suggesting that these structures are involved in cardiac electrophysiology and mechanical function. The contraction of the trabeculae carneae and the papillary muscles prevents the inversion of the mitral and tricuspid valves, maintaining proper blood flow into the heart and preventing backflow of blood from the ventricles into the atria.
Studies have investigated the relationship between left ventricular (LV) trabeculae and papillary muscles (TPM) and their impact on LV volume, mass, and ejection fraction (EF). These studies have found that TPM volume can represent a significant percentage of LVM, ranging from 7.7% to 14% in different cohorts. Hypertrabeculation has been associated with adverse cardiovascular events, highlighting the importance of understanding the volume and mass of TPM in the left ventricle. Further research is needed to fully characterize the distribution and clinical correlates of TPM volume and mass in normal left ventricles.
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Trabecular muscle and cardiac development
The trabecular muscle, or trabeculae carneae, are irregular muscular columns that project from the inner surface of the right and left ventricles of the heart. They are among the first cardiac structures to develop in the embryonic cardiac tube. The trabeculae carneae and the papillary muscles make up a significant percentage of the ventricular mass in the heart (12-17% in normal human adult hearts).
During cardiac development, cardiac progenitor cells from the cardiac crescent migrate toward the ventral midline to form a linear heart tube with a smooth inner surface. When the heart tube undergoes looping, myocardium along the outer curvature of the tube will grow inward and form sheet-like structures that extend from the myocardium—these are the newly initiated trabeculae. As the early embryonic heart does not have a coronary circulatory system to perfuse itself, the sheet-like trabeculae function to increase surface area to facilitate nutrients and oxygen exchange. A lack of trabecular formation will result in embryonic lethality.
The trabeculae carneae are different from the pectinate muscles, which are present in the atria of the heart. Some trabeculae carneae condense to form the myocardium, papillary muscles, chordae tendineae, and septum. The chordae tendineae function to prevent the inversion of the valves into the atrium during ventricular contraction. The right ventricle also contains a specialized trabeculum known as the septomarginal trabecula, or the moderator band, which helps transport a part of the heart's conduction system.
The role of the trabeculae carneae in the function of the ventricles is not yet fully understood. However, their fractal branching pattern helps maintain cardiac performance in both healthy and failing hearts by increasing contractility and stroke work. Trabecular morphology is also important to intraventricular conduction, suggesting that these complex structures are involved in cardiac electrophysiology as well as mechanical function.
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Trabecular muscle and myocardial maturation
Trabecular muscle, also known as trabeculae carneae, refers to rounded or irregular muscular columns that project from the inner surface of the right and left ventricles of the heart. They are distinct from pectinate muscles, which are found in the heart's atria. Trabecular muscles are among the first cardiac structures to develop in the embryonic cardiac tube, and they play a crucial role in supplying oxygen to the myocardium during early development.
The ventricular trabecular myocardium develops as a sponge-like network of cardiomyocytes, which is essential for the maturation of the ventricular chamber and the development of the conduction system. Trabecular muscle development is influenced by gene expression regulating cardiomyocyte polarity, cell adhesion, and actin cytoskeleton dynamics. The compaction process increases the thickness of the compacted myocardium, providing the rotational and contractile function of the left ventricular myocardium.
Myocardial maturation results in the formation of two myocardial zones: a trabecular zone adjacent to the endocardium and a subepicardial compact zone. The trabecular zone, with its complex morphology, contributes to efficient cardiac performance by increasing contractility and modifying flow dynamics. The fractal branching pattern of trabecular muscles helps maintain cardiac performance in both healthy and failing hearts.
The role of trabecular muscles in the adult heart is not yet fully understood. However, they are believed to be involved in cardiac electrophysiology and mechanical function. Trabecular muscles may also contribute to maintaining intraventricular flow patterns and force transmission in health and disease. Alterations in trabecular development can lead to congenital defects such as left ventricular noncompaction, highlighting the critical role of trabecular muscles in myocardial maturation and overall cardiac function.
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Trabecular muscle and cardiovascular imaging
Trabecular muscle, or trabeculae carneae, are irregular muscular columns found within the left and right ventricles of the heart. They are among the first cardiac structures to develop in the embryonic cardiac tube. The trabecular network accounts for a significant portion of human ventricular mass, and their contraction is important for controlling the flow of blood into the heart.
Despite the trabecular network's significant contribution to ventricular mass, its role in ventricular function is not well understood. This is partly due to the difficulty in resolving trabeculae carneae in clinical cardiac imaging modalities. To address this, researchers have developed procedures for high-resolution ex-vivo imaging of internal heart structures, including the trabecular network. For example, a study by the Southwest Research Institute used high-resolution X-ray Computerized Tomography (CT) scans to capture detailed images of explanted human hearts.
Cardiovascular imaging techniques such as cardiac magnetic resonance (CMR) imaging have been used to assess the relationship between left ventricular (LV) trabeculae and papillary muscles (TPM) and clinical characteristics. These studies have found that hypertrabeculation is associated with adverse cardiovascular events, but the distribution and clinical correlates of TPM volume and mass in a normal left ventricle are not yet well understood.
Further research has utilized CMR to study the impact of TPM on quantitative measures of LV volume, mass, and ejection fraction (EF). These studies have found that TPM volume and mass differ between healthy individuals and those with cardiovascular disease or hypertension. For example, one study found that trabeculae comprised ~10% of LVM in healthy subjects and 14% in patients with systolic dysfunction.
In summary, trabecular muscle plays an important role in controlling blood flow into the heart, and its structure and function can be visualized and studied using advanced cardiovascular imaging techniques such as CT and CMR. These imaging techniques have improved our understanding of the relationship between TPM and cardiovascular health, and further research in this area may lead to improved diagnosis and prognosis of hypertrabecular disorders of the myocardium.
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Frequently asked questions
Trabecular muscles, or trabeculae carneae, are rounded or irregular muscular columns that project from the inner surface of the right and left ventricles of the heart.
Trabecular muscles aid in the flow of blood by preventing the suction that would occur if the internal surfaces of the ventricular wall were smooth. Their contraction pulls on the chordae tendineae, preventing inversion of the mitral and tricuspid valves.
There are three types of trabecular muscles: some are attached along their entire length on one side and form prominent ridges; others are fixed at their extremities but free in the middle; and a third set, known as musculi papillares, are continuous with the wall of the ventricle while their apices give origin to the chordae tendineae.
Trabecular muscles, or trabeculae carneae, are different from pectinate muscles, which are the muscular ridges in the atria of the heart.
Trabecular muscles are among the first cardiac structures to develop in the embryonic cardiac tube. During development, some trabecular muscles condense to form the myocardium, papillary muscles, chordae tendineae, and septum.
