The blastocyst is composed of an outer layer of tropoblast and inner cell mass
The blastocyst forms when the outer layer of cell of morula absorbs fluid which is called collected in a cavity from with in the cell mass .This cavity is called as blastocoel.
The tropoblast surrounds the blastocoel and the inner cell mass.
The inner cell mass taken part in the formation of the embryo ,where as the tropoblast give rise to the extra embryonic membrane such as chorion and amnion .
The zona pellucida disappears during blastocyst formation .
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