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Development of the early human placenta: a morphometric study.

E Jauniaux1, G J Burton, G J Moscoso

  • 1Histopathologic Institute, Loverval, Belgium.

Placenta
|May 1, 1991
PubMed
Summary
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Early placental development shows decreasing villous barrier and trophoblastic thickness with gestational age. These key structural changes in early pregnancy are crucial for understanding normal and abnormal fetal development.

Area of Science:

  • Human Embryology
  • Reproductive Biology
  • Developmental Biology

Background:

  • Early placental development is critical for successful pregnancy.
  • Understanding villous development trends provides insights into pregnancy complications.

Purpose of the Study:

  • To investigate morphological trends in early human villous development.
  • To establish baseline histomorphometric data for normal early placentae.

Main Methods:

  • Morphological and histomorphometric investigation of 46 placentae (6-15 weeks gestation).
  • Utilized phase contrast microscopy, histomorphometry, and scanning electron microscopy.
  • Measured villous barrier thickness, trophoblastic layer thickness, and constituent volume fractions.

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Main Results:

  • Significant negative correlations found between gestational age and villous barrier/trophoblastic thickness.
  • Embryonic period (5-10 weeks) showed greater mean barrier thickness, trophoblastic thickness, and trophoblast volume fraction compared to the fetal period (11-15 weeks).
  • Fetal period exhibited increased stroma and capillary volume fractions and capillary profiles per villous profile.

Conclusions:

  • Early placental villi undergo significant structural remodeling between the embryonic and fetal periods.
  • Established histomorphometric data can aid in differentiating normal from abnormal early pregnancy development.
  • Further comparison with abnormal pregnancy data may elucidate origins of developmental changes.