The flattened cell mass developed during the early embryonic stage, which has an outer ectoderm and an inner endoderm, is called a chorion.

Name: The flattened cell mass developed during the early embryonic stage, which has an outer ectoderm and an inner endoderm, is called a chorion.
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The flattened cell mass described is called a bilaminar disc, not a chorion. The chorion is an extraembryonic membrane that develops into the major part of the placenta.

The Flattened Cell Mass Developed During the Early Embryonic Stage