The three main parts of the blastocyst are the trophoblast, inner cell mass (embryoblast), and blastocyst cavity (blastocele).

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Quizplus · Accepted Answer

The blastocyst, which is an early stage in embryonic development, indeed consists of three main parts: the trophoblast (which gives rise to the placenta), the inner cell mass (embryoblast) that will develop into the embryo, and the blastocyst cavity (blastocele), a fluid-filled cavity.

The Three Main Parts of the Blastocyst Are the Trophoblast