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[Utero-trophoblastic interface: transitory stage in human placentation]
1Service de Gynécologie et d'Obstétrique de l'Université de Liège.
Bulletin Et Memoires De L'Academie Royale De Medecine De Belgique
|January 1, 1994
Summary
Early human placenta development shows the intervillous space fills with cell-free maternal blood plasma. This suggests the placenta lacks its expected functions during the first trimester.
Area of Science:
- Human Embryology and Development
- Reproductive Biology
- Maternal-Fetal Medicine
Background:
- Previous studies of the human placenta's intervillous space relied on samples from spontaneous abortions.
- This limited understanding of early placental development in normal pregnancies.
Purpose of the Study:
- To investigate the characteristics of the intervillous space during the first trimester of normal human pregnancies.
- To assess the functional status of the early human placenta.
Main Methods:
- Employed endocavitary ultrasonography for in-vivo observation.
- Utilized chorionoscopy for direct visualization during the first trimester.
Main Results:
- Observed the intervillous space filled with a cell-free plasmatic fraction of maternal blood.
- Demonstrated that the human placenta does not exhibit its theoretical functional specificities during this early stage.
Conclusions:
- The early human placenta's intervillous space is characterized by maternal plasma, not yet fully developed fetal circulation.
- This finding indicates a period of functional immaturity for the placenta in the first trimester.