Just some interesting facts.
blastomeres
notice that the resulting cells are smaller than the original zygote and are called blastomeres
Blastocyst
Blastocyst
A fluid-filled, hollow ball of cells
*at the 32 cell stage fluid enters the morula, collects betweens the blastomeres and reorganizes them around a large fluid filled cavity call the blastocyst cavity (blastocoel)
*morula becomes a blastocyst
*the blastocyst is still about the same size as the original zygote
*zona pellucida begins to degenerate and blastocyst is closer to or in uterus by now
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After floating freely for a few days the blastocyst loosely attaches to the endometrium (implantation)
*the blastocyst sheds the zona pellucida
*once implantation begins the blastocyst cells will change into two distinct cell types-the trophoblast and the inner cell mass.
Now a question. Is the Blastocyst actually slightly smaller than the original Zygote? Interesting.
