Septomarginal trabecula
Trabecula septomarginalis
- Synonym: Septal band
- Eponym: Leonardo's cord; Da Vinci's cord
- Related terms: Septomarginal trabecula; Moderator band
Definition
The septomarginal trabecula (Moderator band) is a muscular band of heart tissue found in the right ventricle that extends from the interventricular septum to the anterior papillary muscle of the right ventricle.
Its primary function is to assist in preventing overdistension of the ventricle and carry part of the right bundle branch of the atrioventricular conduction system to the anterior papillary muscle, facilitating coordinated contraction of the right ventricle. Anatomical studies have shown that the moderator band is present in the majority of human hearts, though its size and morphology can vary significant
The septomarginal trabecula (mderator band) presents two limbs.
The parietal limb of the septomarginal trabecula is the posteroinferior limb and supports the muscular septum, and the medial papillary muscle typically originates from this section, contributing to the stability and function of the tricuspid valve.
The anterior limb of the septomarginal trabecula runs up to the attachment of the pulmonary valve leaflets. It is integral to the structure of the right ventricle, ensuring proper alignment and function of the outflow tract.
References
This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).
Anatomical Observations of the Moderator Band. Loukas M, Klaassen Z, Tubbs RS, et al. Clinical Anatomy (New York, N.Y.). 2010;23(4):443-50. doi:10.1002/ca.20968.
