Septomarginal trabecula
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| Moderator band | |
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| Interior of right side of heart. (Septomarginal trabecula visible at bottom right, but not labeled.) | |
| Latin | trabecula septomarginalis |
| Gray's | subject #138 532 |
| Dorlands/Elsevier | t_14/12815165 |
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.
[edit] See also
[edit] External links
- 1328873532 at GPnotebook
- septomarginal+trabecula at eMedicine Dictionary
- Atlas of anatomy at UMich ht_rt_vent - "Right atrioventricular bundle branch, anterior view"
- Photo of "septomarginal trabiculation" at acc.org
- Photo with caption "moderator band" at tjc.edu
- Sonogram
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