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A section through inner cell mass (embryoblast) of an expanded embryo

Light microscopic view of a stage 3 embryo in vitro through the inner cell mass (embryoblast) (ICM) of an expanded blastocyst 170 hours post-insemination. The collapse of the blastocystic cavity (blastocoele) (BC) and indention of the mural trophoblast (T) occurred during processing.

From: Lopata et al., 1982. Reproduced with permission of the publisher, John Wiley & Sons.

Keywords: blastocystic cavity (blastocoele), expanded embryo, inner cell mass (embryoblast), mural trophoblast

Source: The Virtual Human Embryo.