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Ultrastructural development of the equine placenta.

C A Samuel, W R Allen, D H Steven

    Journal of Reproduction and Fertility. Supplement
    |October 1, 1975
    PubMed
    Summary

    The equine placenta

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    Area of Science:

    • Reproductive biology
    • Veterinary anatomy
    • Developmental biology

    Background:

    • Microcotyledons are key structures in the mature equine placenta.
    • Their development involves complex folding of trophoblast and maternal crypt formation.

    Purpose of the Study:

    • To describe the developmental changes in equine placental microcotyledons.
    • To detail the ultrastructural characteristics of fetal and maternal epithelia during gestation.

    Main Methods:

    • Histological examination of equine placental tissues at various gestational stages.
    • Ultrastructural analysis of fetal and maternal epithelial layers.

    Main Results:

    • Microcotyledons are fully formed by Day 150.
    • Maternal epithelium height decreases between Days 60-150.
    • Fetal capillaries indent the maternal epithelium between Days 100-250, reducing placental barrier thickness.

    Conclusions:

    • Equine placental microcotyledon development involves significant maternal epithelial remodeling.
    • Changes in placental barrier thickness occur progressively during gestation.

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