![]() ![]() This is also the time when the zona pellucida begins to disappear, allowing the ball of cells, now called a blastocyst, to grow and change shape. The inner cell mass will continue to differentiate and parts of it will eventually become the embryo, so it is sometimes called the embryoblast (the suffix “blast” means “to make”). The outer trophoblast will develop into structures that help the growing embryo implant in the mother’s uterus. The rest of the fluid-filled cavity is called the blastocoel, and the whole setup resembles a snow globe. Rather than being arranged in a solid sphere of cells, the inner cell mass is pushed off to one side of the sphere formed by the trophoblast. Two layers develop: an outer shell layer known as the trophoblast, and an inner collection of cells called the inner cell mass. an ear cell or a kidney cell), and this process (99% of the time) only goes in one direction. When a cell differentiates, it moves down a certain path toward being a specific type of cell (e.g. ![]() Around day 4, cells continue to divide, but they also begin to differentiate and develop more specific forms and functions. ![]()
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