Moderator band (heart)

Moderator band
Interior of right side of heart. (Septomarginal trabecula visible at bottom right, but not labeled.)
Details
Identifiers
Latin	trabecula septomarginalis
Dorlands /Elsevier	12815165
TA	A12.1.02.020
FMA	7272
*Anatomical terminology* [edit on Wikidata]

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.

The moderator band is important because it carries part of the right bundle branch of the AV bundle of the conduction system of the heart to the anterior papillary muscle. This shortcut across the chamber of the ventricle seems to facilitate conduction time, allowing coordinated contraction of the anterior papillary muscle.

From its attachments it was thought to prevent overdistension of the ventricle, and was named the "moderator band".

The moderator band is often used by radiologists and obstetricians to more easily identify the right ventricle in prenatal ultrasound.

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Anatomy of the heart

General

Surface

Internal

atria interatrial septum pectinate muscles terminal sulcus ventricles interventricular septum trabeculae carneae chordae tendineae papillary muscle valves cusps atrioventricular septum

cardiac skeleton intervenous tubercle

Chambers

Right heart	(venae cavae, coronary sinus) → right atrium (atrial appendage, fossa ovalis, limbus of fossa ovalis, crista terminalis, valve of inferior vena cava, valve of coronary sinus) → tricuspid valve → right ventricle (infundibulum, moderator band/septomarginal trabecula) → pulmonary valve → (pulmonary artery and pulmonary circulation)

Left heart	(pulmonary veins) → left atrium (atrial appendage) → mitral valve → left ventricle → aortic valve (aortic sinus) → (aorta and systemic circulation)

Layers

Endocardium	heart valves

Myocardium	Conduction system cardiac pacemaker SA node AV node bundle of His bundle branches Purkinje fibers

Pericardial cavity	pericardial sinus

Pericardium	fibrous pericardium sternopericardial ligaments serous pericardium epicardium/visceral layer fold of left vena cava

Blood supply

Coronary circulation

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Moderator band (heart)

See also

External links