As cleavage proceeds the ovum comes to have 16 cells. this is known as morula.
The morula consists of an inner cell mass that is completely surrounded by an outer layer of cells. The cells of the outer layer later give rise to trophoblast
Fate :
It divides into two layers outer and inner. The inner one is cellular and called as cytotrophoblast. The outer one having no cell boundary is termed syncytotrophoblast . these two together with primary mesoderm constitute chorion .
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