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Final cavitation

Stage 3 embryo in vitro in final cavitation. The blastocystic cavity (blastocoele) occupies approximately 50% of the embryo's volume. Increase in overall size of the blastocyst has not yet occurred. The blastomeres are separated into an inner cell mass (embryoblast) and a trophoblast group.

From: Veeck and Zaninovic´, 2003. Reproduced with permission of the publisher, Francis and Taylor Group.

Keywords: abembryonic pole, blastocyst(s), embryonic pole, final cavitation, inner cell mass (embryoblast), mural trophoblast, polar trophoblast, trophoblast, zona pellucida

Source: The Virtual Human Embryo.