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The arterial orifice level in the early human embryo
M M Bartelings1, A C Gittenberger-de Groot
1Department of Anatomy and Embryology, University of Leiden, The Netherlands.
Anatomy and Embryology
|January 1, 1988
Summary
The arterial orifice level in human embryos develops a curved and twisted configuration, influencing early heart septation and outlet dimensions. This configuration resembles that of a fully developed heart by 9.5 mm crown-rump length.
Area of Science:
- Embryology
- Cardiovascular Development
- Human Anatomy
Background:
- The development of the arterial outlets is crucial for normal heart function.
- Understanding the early stages of septation provides insight into congenital heart defects.
Purpose of the Study:
- To investigate the microscopic configuration of the arterial orifice level in early human embryos.
- To analyze the developmental changes in the arterial orifice level and its relation to septation.
Main Methods:
- Microscopic examination of 7 human embryos (6-9.5 mm crown-rump length).
- Reconstruction techniques to visualize the three-dimensional structure of the developing heart.
Main Results:
- At 6-7 mm, the arterial orifice level is curved, extending to branchial arch arteries, initiating aortopulmonary septum formation.
- By 9-9.5 mm, the arterial orifice level exhibits a twisted configuration, leading to differential lengths of the pulmonary trunk and ascending aorta.
- The aortopulmonary septum's position varies, extending more proximally in the pulmonary outlet than the aortic outlet.
Conclusions:
- The early configuration of the arterial orifice level significantly impacts the relative dimensions of the great arteries.
- The observed changes suggest that key features of the adult heart's arterial outlets are established during early embryonic development.