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Epicardial formation in staged human embryos
1Department of Anatomy, Saitama Medical School, Japan.
Kaibogaku Zasshi. Journal of Anatomy
|October 1, 1992
Summary
This study details human epicardial formation using light microscopy on early human embryos. It reveals epicardium development, originating from the sinus venosus, spreading across the embryonic heart by Carnegie stage 16.
Area of Science:
- Developmental Biology
- Human Embryology
- Cardiovascular Science
Background:
- Epicardial formation is well-understood in vertebrates via electron microscopy.
- Detailed information on human epicardial development is currently lacking.
Purpose of the Study:
- To elucidate the process of epicardial formation in human embryos.
- To fill the knowledge gap regarding early human heart development.
Main Methods:
- Light microscopic observation of serial paraffin sections.
- Analysis of human embryos at Carnegie stages 12 to 17.
Main Results:
- Initial epicardium formation observed at Carnegie stage 12 in 2/6 embryos.
- Epicardium extends from the sinus venosus, covering the ventricle as a squamous epithelium.
- Complete epicardial coverage of the heart is estimated by late Carnegie stage 16.
Conclusions:
- The study provides the first light microscopic description of human epicardial formation.
- Findings suggest a similar mechanism of epicardial development to that observed in chick embryos.
- This research clarifies a critical aspect of human cardiovascular embryogenesis.