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Type: Journal article
Title: Changes in structure of the trophectoderm of a marsupial in Mid-pregnancy up to the time of implantation
Author: Roberts, C.
Breed, W.
Citation: Reproduction Fertility and Development, 1996; 8(4):797-802
Publisher: CSIRO Publishing
Issue Date: 1996
ISSN: 1031-3613
Statement of
C. T. Roberts and W. G. Breed
Abstract: Pre- and peri-implantation embryos of the dasyurid marsupial Sminthopsis crassicaudata were examined for morphological differentiation of the trophectoderm. The cells of unilaminar blastocysts were all squamous and stained intensely with toluidine blue. In bilaminar blastocysts and embryos at the early embryonic-disc stage, the trophectoderm was similar in appearance to, but stained more lightly than, the underlying endoderm. Trophoblast differentiation did not appear to occur until the mesoderm had begun to migrate between the trophoblast and endoderm beyond the embryonic disc. At this stage, trophoblasts had three distinct morphologies: (1) vacuolated, tall and columnar cells in the trilaminar region; (2) large cuboidal cells in the adjacent bilaminar region; and (3) squamous cells in the abembryonic pole of the bilaminar region. These variations in cell structure correlate with differences in subsequent functional activity in these three regions of the yolk sac placenta.
Keywords: Yolk Sac
Cell Differentiation
Embryonic and Fetal Development
Embryo Implantation
Embryo, Mammalian
Rights: © CSIRO 1996
DOI: 10.1071/RD9960797
Appears in Collections:Anatomical Sciences publications
Aurora harvest 5
Environment Institute publications

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