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Related Experiment Videos

[Structure of the placenta in bears].

G Michel

    Anatomischer Anzeiger
    |January 1, 1984
    PubMed
    Summary

    The placenta of the spectacled bear (Tremarctos ornatus) is discoidal with a marginal hematoma. Histology reveals an endotheliochorial placenta featuring a labyrinth and transitional zone.

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    Area of Science:

    • Comparative placental morphology
    • Mammalian reproductive biology
    • Ursid anatomy

    Context:

    • Limited data on spectacled bear (Tremarctos ornatus) placentation.
    • Understanding reproductive strategies in bears.

    Purpose:

    • To describe the gross and histological features of the spectacled bear placenta.
    • To classify the placental type based on its structure.

    Summary:

    • The spectacled bear placenta exhibits a discoidal form (placenta discoidalis).
    • A distinct marginal hematoma is present.
    • Histological examination reveals an endotheliochorial placental type, characterized by a placental labyrinth and a notable transitional zone.

    Impact:

    • Contributes to the understanding of bear reproductive anatomy.
    • Provides a basis for comparative studies within the Ursidae family.
    • Enhances knowledge of placental evolution in mammals.