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Updated: Feb 17, 2026
Analysis of Coronary Vessels in Cleared Embryonic Hearts
Published on: December 7, 2016
Avian embryonic coronary arterio-venous patterning involves the contribution of different endothelial and endocardial
Paul Palmquist-Gomes1,2, Juan Antonio Guadix1,2, José M Pérez-Pomares1,2
1Department of Animal Biology, Faculty of Sciences, University of Málaga, Instituto Malagueño de Biomedicina (IBIMA), Campus de Teatinos s/n, 29080, Málaga, Spain.
Insights
Coronary vascular development involves multiple embryonic origins, including sinus venosus endocardial sprouts and proepicardial angioblasts. These cells assemble to form the heart
Area of Science:
- Developmental biology
- Cardiovascular research
- Embryology
Background:
- The coronary vasculature is vital for heart function from embryonic development through adulthood.
- Detailed knowledge of the embryonic origins and patterning mechanisms of coronary vessels is lacking.
- Understanding coronary vascular development is crucial for addressing congenital heart defects.
Purpose of the Study:
- To investigate the ontogenetic origin and morphogenesis of coronary vasculature using the avian embryo model.
- To identify the cellular sources contributing to coronary vascular formation.
- To elucidate the mechanisms regulating coronary arterio-venous patterning.
Main Methods:
- Utilized avian embryos as a model system for studying embryonic development.
- Employed techniques to trace the origin and migration of vascular cells.
- Observed the assembly and patterning of coronary vasculature during embryogenesis.
Main Results:
- Coronary vascular formation is initiated by simultaneous invasion of the heart by sinus venosus endocardial sprouts and proepicardial angioblasts.
- Avian ventricular endocardium and cardiac distal outflow tract endothelial cells also contribute to coronary vessel formation.
- Coronary arterio-venous shunts form prior to the connection of the peritruncal arterial endothelium to the aortic root.
Conclusions:
- Embryonic coronary vasculature is a developmental mosaic.
- Vascular cells from at least four distinct embryological origins integrate to form the coronary vasculature.
- Coordinated assembly of these diverse cell populations is essential for complete coronary vascular development.
Background:
Coronary vasculature irrigates the myocardium and is crucial to late embryonic and adult heart function. Despite the developmental significance and clinical relevance of these blood vessels, the embryonic origin and the cellular and molecular mechanisms that regulate coronary arterio-venous patterning are not known in detail. In this study, we have used the avian embryo to dissect the ontogenetic origin and morphogenesis of coronary vasculature.
Results:
We show that sinus venosus endocardial sprouts and proepicardial angioblasts pioneer coronary vascular formation, invading the developing heart simultaneously. We also report that avian ventricular endocardium has the potential to contribute to coronary vessels, and describe the incorporation of cardiac distal outflow tract endothelial cells to the peritruncal endothelial plexus to participate in coronary vascular formation. Finally, our findings indicate that large sinus venosus-independent sections of the forming coronary vasculature develop without connection to the systemic circulation and that coronary arterio-venous shunts form a few hours before peritruncal arterial endothelium connects to the aortic root.
Conclusions:
Embryonic coronary vasculature is a developmental mosaic, formed by the integration of vascular cells from, at least, four different embryological origins, which assemble in a coordinated manner to complete coronary vascular development. Developmental Dynamics 247:686-698, 2018. © 2017 Wiley Periodicals, Inc.
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