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ULTRASTRUCTURAL CHANGES IN EMBRYONIC ECTODERMAL CELLS OF THE NEURULATING RAT EMBRYO.
Yoshiko K Takeuchi1, Ikuo K Takeuchi2
1First Department of Anatomy, Nagoya University School of Medicine, Nagoya 466, Japan.
Development, Growth & Differentiation
|June 7, 2023
Summary
Early rat embryo ectodermal cells show unique ultrastructural changes before neurulation, including protrusions and vacuoles. These changes are specific to embryonic ectoderm and related amniotic cells, not other cell types.
Area of Science:
- Developmental biology
- Cell biology
- Embryology
Background:
- Neurulation is a critical process in embryonic development.
- Understanding cellular changes during early neurulation is key to developmental biology.
Purpose of the Study:
- To investigate the ultrastructural changes in embryonic ectodermal cells during early rat embryo neurulation.
- To identify specific cellular alterations preceding and during neurulation.
Main Methods:
- Light microscopy and electron microscopy were used.
- Rat embryos at specific developmental stages (day 9-6 hr and day 9-12 hr) were examined.
Main Results:
- Before neurulation, embryonic ectodermal cells exhibited apical cytoplasmic protrusions, free spherules, vacuoles, mitochondrial ballooning, and endoplasmic reticulum dilation.
- These changes were also observed in amniotic cells derived from embryonic ectoderm, but not in extraembryonic mesoderm or neuroectodermal cells.
- During mid-neurulation, these specific ultrastructural changes disappeared as cells flattened.
Conclusions:
- The observed ultrastructural changes are specific to embryonic ectodermal and related amniotic cells during early neurulation.
- The functional significance of these cellular changes warrants further investigation in the context of cell differentiation and tissue morphogenesis.
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