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The fibrous skeleton in the human heart: embryological and pathogenetic considerations
Insights
The human heart's fibrous skeleton develops from various extracardiac sources. Understanding its embryology, particularly the central fibrous body, is crucial for congenital heart defect research.
Area of Science:
- Embryology
- Cardiac Anatomy
- Developmental Biology
Background:
- The fibrous skeleton is a critical structural component of the human heart.
- Its development involves complex interactions between multiple tissue sources, primarily extracardiac.
- Understanding the origins of the fibrous skeleton is key to comprehending cardiac development and pathology.
Purpose of the Study:
- To elucidate the embryological origins of the human heart's fibrous skeleton.
- To detail the formation of the atrioventricular valve rings and the central fibrous body.
- To correlate these developmental findings with specific cardiac abnormalities.
Main Methods:
- Review of embryological development of the heart.
- Analysis of tissue sources contributing to the fibrous skeleton.
- Correlation of embryological findings with known cardiac malformations.
Main Results:
- Atrioventricular valve rings form from invaginated sulcus tissue.
- The central fibrous body originates from the dorsal mesocardium and sulcus tissue interacting with the left bulbar ridge.
- A portion of atrioventricular endocardial cushions is incorporated into the central fibrous body.
Conclusions:
- Embryological insights into the central fibrous body formation have significant implications for understanding congenital heart defects.
- Specific cardiac abnormalities, including atrioventricular conduction system defects, cor triatriatum sinistrum, and atrioventricular defects, are linked to these developmental processes.
Abstract:
The fibrous skeleton of the human heart is composed of several parts which are formed from different, mainly extracardiac sources. The atrioventricular valve rings are formed by invagination of sulcus tissue at the atrioventricular and bulboventricular transitions. The atrial part of the central fibrous body is formed from an ingrowth of tissue from the dorsal mesocardium, the ventricular part from ingrowth of sulcus tissue towards an endocardial structure, the left bulbar ridge. During valve development the atrioventricular endocardial cushions, initially situated between the developing atrial and ventricular parts of the central fibrous body, are almost completely removed downwards into the ventricular cavities. However, a small portion of these cushions remains on top of the ventricular septum, is "trapped" by the surrounding sulcus tissues and becomes incorporated in the central fibrous body. These embryological findings on this centrally located area of the heart have implications for certain types of cardiac abnormalities. In this respect the atrioventricular conduction system, cor triatriatum sinistrum and atrioventricular defect are discussed.