Inner Cell Mass (ICM): The ICM will form the embryo itself, differentiating into the three germ layers that give rise to all the tissues and organs of the body.

Trophectoderm: The trophectoderm forms the placenta, providing the necessary support for the developing embryo.

Early Development: The ICM and trophectoderm work together to initiate early development, with the ICM forming the embryo and the trophectoderm aiding in implantation and nutrient exchange.

Formation of Extra-Embryonic Tissues: The trophectoderm also contributes to forming extra-embryonic tissues essential for embryo survival and growth.

Review: Fertilisation and the Luteal Phase (Physiology 2)