How Embryo Is Formed

Embryo development

The embryo in humans starts to take form after four days of fertilization. Initially, the solid ball of cells, a tiny mass forms – the zygote. This eventually turns into a hollow cluster of cells known as the blastocyst. This structure in the uterus is then implanted into the uterus’ wall. Here, it develops into an embryo which is attached to the placenta and engirdled by a fluid-filled membrane.

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