What is the function of the moderator band in the heart?
The moderator band is important because it carries part of the right bundle branch of the atrioventricular bundle of the conduction system of the heart to the anterior papillary muscle.
What heart chamber contains the moderator band?
The moderator band is located in the right ventricular apex that connects the interventricular septum to the anterior papillary muscle.
What is moderator band composed of?
The moderator band is covered externally by the endocardium that is mainly consisting of the endothelial layer of simple squamous epithelium, subendothelial layer of loose connective tissue and the subendocardial layer that connects the endocardium with myocardium.
Where is the moderator band in the heart?
In the human heart, the moderator band, or trabecula septomarginalis, is a muscle column that courses inferiorly from the right portion of the interventricular septum to the base of the anterior papillary muscle of the right ventricle This muscular structure is crossed by one or more arteries, which come from the …
Which feature marks the border between the atria and the ventricles?
The septum between the atria and ventricles is known as the atrioventricular septum. It is marked by the presence of four openings that allow blood to move from the atria into the ventricles and from the ventricles into the pulmonary trunk and aorta.
What is the most muscular chamber of the heart?
The left ventricle, the most muscular chamber of the heart, then contracts with enough pressure to send the blood through the aortic valve and into the aorta. After the blood passes through the aortic valve it closes to prevent backflow of blood into the left ventricle.
What is the function of Chordae Tendineae?
The chordae tendineae make up the leaflet suspension system that ultimately determine and maintain the position and tension on the valve leaflets at end of systole. The chordae originate from the fibrous heads of the papillary muscles and may be classified according to their site of insertion on the leaflet.
Is there a moderator band in the left ventricle?
Location: Also called false tendons, false chordate and left ventricular moderator bands among other names, left ventricular bands are fibromuscular structures in the left ventricle crossing the cavity or simply joining nearby trabeculations or papillary muscles left ventricle.
Which heart chamber has the thickest walls?
The left ventricle of your heart is larger and thicker than the right ventricle. This is because it has to pump the blood further around the body, and against higher pressure, compared with the right ventricle.
What are the 3 coverings of the heart?
Three layers of tissue form the heart wall. The outer layer of the heart wall is the epicardium, the middle layer is the myocardium, and the inner layer is the endocardium.
The moderator band (also known as septomarginal trabecula) is a muscular band of heart tissue found in the right ventricle of the heart. It is well-marked in sheep and some other animals, and frequently extends from the base of the anterior papillary muscle to the ventricular septum.
How is the moderator band used in ultrasound?
The moderator band is often used by radiologists and obstetricians to more easily identify the right ventricle in prenatal ultrasound . From its attachments it was thought to prevent overdistension of the ventricle, and was named the “moderator band”.
What are the normal bands in the heart?
These bands can be classified as normal structures or normal variants, aberrant structures, or pathologic entities. Normal structures include the crista terminalis, taenia sagittalis, Chiari network, coumadin ridge, moderator band, papillary muscles, and chordae tendineae.
Are there bands in the heart on a radiograph?
The bands themselves are not depicted on radiographs, but occasionally secondary changes, such as cardiomegaly, enlargement of a specific chamber, heart failure, and pulmonary oligemia or plethora, may be depicted. Transthoracic echocardiography is the first-line imaging modality used in the evaluation of the heart.