The inner cell mass of the blastocyst forms a large fluid-filled sphere.

Name: The inner cell mass of the blastocyst forms a large fluid-filled sphere.
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The inner cell mass of the blastocyst actually forms the embryo and some of the extraembryonic tissues, not a large fluid-filled sphere. The fluid-filled sphere is formed by the blastocyst cavity (blastocoel) itself, which is surrounded by a layer of cells (trophectoderm) that will contribute to the placenta.

The Inner Cell Mass of the Blastocyst Forms a Large