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Related Experiment Videos

Myeloschisis in early human embryos.

K Osaka, S Matsumoto, T Tanimura

    Child'S Brain
    |January 1, 1978
    PubMed
    Summary

    This study reports the smallest human embryos with open myeloschisis, suggesting the condition arises from the neural plate failing to close. Findings challenge existing theories on neural tube defects.

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    Area of Science:

    • Developmental biology
    • Embryology
    • Teratology

    Background:

    • Open myeloschisis is a severe neural tube defect.
    • Previous research suggested a defective limiting membrane causes neural overgrowth and polarity loss.

    Purpose of the Study:

    • To report and characterize the earliest human embryos exhibiting open myeloschisis.
    • To investigate the developmental origins and cellular characteristics of early myeloschisis.

    Main Methods:

    • Histological examination of four human embryos (Carnegie stages 12-14) with open myeloschisis.
    • Microscopic analysis of neuroectodermal junctions, cellular polarity, and limiting membranes.

    Main Results:

    • Four human embryos with open myeloschisis, including the smallest reported at Carnegie stage 12.
    • No evidence of forced opening; smooth neuroectodermal junctions suggest failure of neural plate closure.
    • Well-preserved cellular polarity and limiting membranes despite neural tissue overgrowth.

    Conclusions:

    • Open myeloschisis likely originates from a failure of neural plate closure, not post-closure defects.
    • Findings contradict the hypothesis that a defective limiting membrane causes polarity loss and neural overgrowth in myeloschisis.

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