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TRANSFER OF CELLULAR MATERIAL BETWEEN THE UTERINE EPITHELIUM AND TROPHOBLAST DURING THE EARLY STAGES OF IMPLANTATION

During the early attachment phase of implantation of the blastocyst, basically staining bodies are found in the uterine epithelium which have been described by Wilson (1963) as primary invasive cells. He postulates that they are cells passing from the embryonic trophoblast through the maternal epithelium into the uterine stroma. With the light microscope they appear as small, variably shaped, basically staining bodies in which no internal structure can be discerned. Finn & McLaren (1967) have also reported the occurrence of these bodies during implantation but have suggested they be called W-bodies, a name which makes no assumptions about their structure or function.

The bodies are not common and do not appear in all sections through a blastocyst, or indeed in all blastocysts, at the appropriate stage of