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Related Experiment Videos

Scanning electron microscopic observations on developing opossum embryos: days 9 through 12.

W J Krause, J H Cutts

    Anatomischer Anzeiger
    |January 1, 1986
    PubMed
    Summary

    This study details the rapid embryonic development in Didelphis, highlighting key organogenesis stages and external features. It describes the transition from germ layer formation to a fetus-like state within a 12.5-day gestation period.

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    Area of Science:

    • Developmental Biology
    • Embryology
    • Mammalian Reproduction

    Background:

    • Didelphis embryos develop within uterine secretions, separated by a shell membrane.
    • Gestation period is 12.5 days, with organogenesis occurring in the final 3.5 days.

    Purpose of the Study:

    • To describe the key developmental events and morphological changes during early Didelphis embryogenesis.
    • To detail the timeline of organogenesis and external feature development.

    Main Methods:

    • Observational study of embryonic development in Didelphis.
    • Chronological documentation of morphological changes from day 9 to birth.

    Main Results:

    • Germ layers established by day 9; organogenesis accelerates in the final 3.5 days.

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  • Limb buds appear by day 10, with yolk sac envelopment. Mandibular and hyoid arches, digital ridges noted.
  • By day 11, hindlimb buds, eyes, auditory meatus, and protruding tongue are evident. Forelimb digits lack claws.
  • Day 12 features include oral shield, prominent forefoot claws, and hindfoot digital ridges. Periderm covers facial features before birth.

    • Conclusions:

    • Didelphis embryonic development is rapid, culminating in a viable fetus-like organism.
    • The study provides a detailed morphological timeline of Didelphis embryogenesis, crucial for understanding marsupial development.