Moderator band (heart)

The moderator band (also known as septomarginal trabecula[1]) is a band of cardiac muscle found in the right ventricle of the heart.[2][3] It is well-marked in sheep and some other animals, including humans. It extends from the base of the anterior papillary muscle of the tricuspid valve to the ventricular septum.[2]

Moderator band
Interior of right side of heart. (Septomarginal trabecula visible at bottom right, but not labeled.)
Details
Identifiers
Latintrabecula septomarginalis
TA98A12.1.02.020
TA24050
FMA7272
Anatomical terminology

Structure

The moderator band is located in the right ventricle.[2][3] The moderator band connects the base of the anterior papillary muscles of the tricuspid valve to the ventricular septum.[2]

Function

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.[1] This shortcut across the chamber of the ventricle ensures equal conduction time in the left and right ventricles, allowing for coordinated contraction of the anterior papillary muscle.[1]

Clinical significance

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

History

From its attachments it was thought to prevent overdistension of the ventricle, and was named the "moderator band". It was first described by Leonardo da Vinci in his exploration of human anatomy.

Additional images
  • Location of the moderator band
    Location of the moderator band

See also

References
  1. Whitaker, Robert H. (2014-08-01). "Anatomy of the heart". Medicine. Cardiovascular Medicine Part 1 of 4. 42 (8): 406–408. doi:10.1016/j.mpmed.2014.05.007. ISSN 1357-3039.
  2. Rocha, H.; Eliziário, L. F. E.; Wafae, G. C.; Silva, N. C.; Ruiz, C. R.; Wafae, N. (2010-05-01). "Anatomy of the septomarginal trabecula in Landrace pig hearts". Morphologie. 94 (305): 26–29. doi:10.1016/j.morpho.2010.03.004. ISSN 1286-0115. PMID 20359929.
  3. Kosiński, Adam; Nowiński, Janusz; Kozłowski, Dariusz; Piwko, Grzegorz; Kuta, Włodzimierz; Grzybiak, Marek (2007-09-10). "The crista supraventricularis in the human heart and its role in the morphogenesis of the septomarginal trabecula". Annals of Anatomy - Anatomischer Anzeiger. 189 (5): 447–456. doi:10.1016/j.aanat.2007.01.008. ISSN 0940-9602. PMID 17910398.
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