Trabeculae carneae

The trabeculae carneae (columnae carneae, or meaty ridges) are rounded or irregular muscular columns which project from the inner surface of the right and left ventricle of the heart.[1] These are different from the pectinate muscles, which are present in the atria of the heart.

Trabeculae carneae
Details
Identifiers
Latintrabeculae carneae cordis
TA98A12.1.00.020
A12.1.02.021
A12.1.04.011
TA24049, 4071, 4024, 4056
FMA76525
Anatomical terminology

Types

There are two kinds:

  • Some are attached along their entire length on one side and merely form prominent ridges,
  • Others are fixed at their extremities but free in the middle, as in the moderator band in the right ventricle, or the papillary muscles that holds chordae tendinae, which are connected to cusps of valves to control flow of blood into the heart

Function

Trabeculae lie at the interface between intracardiac flow and the compact myocardium. Their fractal branching pattern helps to maintain cardiac performance in both healthy and failing hearts by increasing contractility and stroke work.[2] Trabecular morphology is also important to intraventricular conduction, suggesting these complex structures are involved in cardiac electrophysiology as well as mechanical function.[3] A condensation of trabecular fibres forms the moderator band which carries the right branch of the bundle of His.

The trabeculae carneae also serve a function similar to that of papillary muscles in that their contraction pulls on the chordae tendineae, preventing inversion of the mitral (bicuspid) and tricuspid valves towards the atrial chambers, which would lead to subsequent leakage of the blood back into the atria. By this action on the atrioventricular valves, backflow of the blood from the ventricles into the atria is prevented.

See also

References

This article incorporates text in the public domain from page 532 of the 20th edition of Gray's Anatomy (1918)

  1. Moore, K.L., & Agur, A.M. (2007). Essential Clinical Anatomy: Third Edition. Baltimore: Lippincott Williams & Wilkins. 90-94. ISBN 978-0-7817-6274-8
  2. Meyer HV, Dawes TJW, Serrani M, Bai W, Tokarczuk P, Cai J; et al. (2020). "Genetic and functional insights into the fractal structure of the heart". Nature. 584 (7822): 589–594. doi:10.1038/s41586-020-2635-8. PMC 7116759. PMID 32814899.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  3. Olejníčková V, Šaňková B, Sedmera D, Janáček J (2018). "Trabecular Architecture Determines Impulse Propagation Through the Early Embryonic Mouse Heart". Front Physiol. 9: 1876. doi:10.3389/fphys.2018.01876. PMC 6331446. PMID 30670981.{{cite journal}}: CS1 maint: multiple names: authors list (link)
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