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Related Experiment Video

Updated: Jun 19, 2026

Ex Vivo Perfusion of the Rodent Placenta
06:54

Ex Vivo Perfusion of the Rodent Placenta

Published on: May 30, 2019

Development of the pig placenta.

J L Vallet1, J R Miles, B A Freking

  • 1USDA, ARS, U.S. Meat Animal Research Center, P. O. Box 166, State Spur 18D, Clay Center, Nebraska 68933, USA. jeff.vallet@ars.usda.gov

Society of Reproduction and Fertility Supplement
|October 24, 2009
PubMed
Summary
This summary is machine-generated.

Placental development involves structural changes like folding and thinning of the epithelial bilayer to enhance nutrient exchange. Enzymes like hyaluronoglucosaminidase and heparanase are crucial for placental growth and function.

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Area of Science:

  • Reproductive Biology
  • Developmental Biology
  • Comparative Anatomy

Background:

  • Placental insufficiency leads to adverse fetal outcomes, including poor growth and mortality.
  • Placental development is initiated by conceptus elongation and further defined by allantochorion formation.
  • Implantation involves trophoblast adhesion to the endometrium and the development of specialized placental structures.

Purpose of the Study:

  • To describe the key developmental stages and structural modifications of the placenta.
  • To highlight the mechanisms of nutrient exchange within the developing placenta.
  • To investigate the potential role of specific enzymes in placental development.

Main Methods:

  • Microscopic examination of placental structures throughout gestation.
  • Analysis of fetal and maternal capillary development and arrangement.
  • Investigation of glycosaminoglycan composition and associated enzyme activity.

Main Results:

  • Placental development involves significant folding of the trophoblast-endometrial bilayer, increasing surface area for nutrient exchange.
  • Capillary networks develop adjacent to the bilayer, facilitating cross-countercurrent blood flow.
  • Changes in hyaluronoglucosaminidase and heparanase activity correlate with placental development stages.

Conclusions:

  • Placental structural complexity, including folding and thinning of the epithelial layers, is critical for efficient nutrient transfer.
  • The development of specialized capillary arrangements and the activity of enzymes like hyaluronoglucosaminidase and heparanase are vital for successful placental function.
  • Nutrient-specific transport mechanisms are as important as placental size and structure for nutrient delivery to the fetus.