Trabecula septomarginalis

Trabecula Septomarginalis (TSM), also known as the moderator band, is a prominent muscular band of heart tissue found in the right ventricle of the heart. It plays a crucial role in the electrical conduction system of the heart by ensuring the rapid conduction of electrical impulses. This article provides an in-depth look at the structure, function, and clinical significance of the trabecula septomarginalis.

Structure

The trabecula septomarginalis extends from the interventricular septum to the base of the anterior papillary muscle. It is a part of the intricate internal structure of the right ventricle, which includes other trabeculae carneae. The TSM is composed of specialized cardiac muscle fibers and is covered by endocardium, the innermost layer of the heart. Its unique structure facilitates its role in the heart's electrical conduction system.

Function

The primary function of the trabecula septomarginalis is to facilitate the rapid transmission of electrical impulses within the right ventricle. It is part of the heart's conduction system, which includes the sinoatrial node, atrioventricular node, bundle of His, and Purkinje fibers. The TSM ensures that the contraction of the ventricles is synchronized, contributing to the efficient pumping of blood.

Clinical Significance

Abnormalities in the trabecula septomarginalis can lead to various cardiac conditions. Hypertrophy or enlargement of the TSM can be an indicator of underlying heart disease, such as hypertrophic cardiomyopathy. Additionally, anomalies in the structure or function of the TSM can affect the heart's electrical conduction system, potentially leading to arrhythmias.

See Also

• Cardiac muscle
• Heart
• Electrical conduction system of the heart
• Right ventricle
• Interventricular septum
• Papillary muscle