Health Dictionary
Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.
Septomarginal trabecula
Introduction
The septomarginal trabecula (or moderator band) is a muscular band of heart tissue found in the right ventricle. 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.
From its attachments it was thought to prevent overdistension of the ventricle, and was named the “moderator band”.
However, more recent research has indicated that it is more properly considered part of the electrical conduction system of the heart, and in that capacity it is called the “septomarginal trabecula”. The TA name is “trabecula septomarginalis”.
The moderator band is often used by radiologists to more easily identify the right ventricle in prenatal ultrasound.
External links
External links
- Template:GPnotebook
- Template:EMedicineDictionary
- Template:UMichAtlas – “Right atrioventricular bundle branch, anterior view”
- Photo of “septomarginal trabiculation” at acc.org
- Photo with caption “moderator band” at tjc.edu
- Sonogram
Editor-In-Chief: Template:Infobox Anatomy C. Michael Gibson, M.S., M.D. [1]