Summary
Development of periderm cells covering fore-and hindlimb buds of mouse em`ryos was observed by scanning and transmission electron microscopy at half day intervals from day 9.5 to 12.5 of gestation (vaginal plug=day 0).
At day 9.5, the epidermis is single layered. Occasional periderm cells are present at day 10.5. By day 11.5 a complete layer of periderm cells has covered the entire limb bud.
By scanning electron microscopic observation, periderm cells covering the apical ectodermal ridge (AER) are characterized by a small surface size and an elongated polygonal shape with the long axis parallel to the antero-posterior contour of the apical rim. Periderm cells covering the dorsal and ventral surfaces of the limb bud are relatively large and have a polygonal surface shape.
The periderm covering the apical tip reflects well the developmental state of the AER. Hence, it is possible to estimate the development of the AER by observing the surface features of the apical periderm by scanning electron microscopy.
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This work was supported by Scientific research Grant No. 348082 from the Ministry of Education, Japan
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Nakamura, H., Yasuda, M. An electron microscopic study of periderm cell development in mouse limb buds. Anat Embryol 157, 121–132 (1979). https://doi.org/10.1007/BF00305153
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DOI: https://doi.org/10.1007/BF00305153
