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Neural Crest Cells

It is sequence of events that begins with contact between a sperm and a  oocyte and finally ends with the fusion of nuclei of the sperm and ovum and the intermingling of maternal and paternal chromosomes.

  • Finger like processes of syncytiotrophoblast extend through the endometrial epithelium
  • Time:by the end of the first week blastocyst superficially implants in the endometrium.
  • Also  a flattened layer of cells called hypoblast appear on the surface of the inner cell mass.


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