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Zona Pellucida

A translucent noncellular layer, which surrounds the egg and embryo. Just prior to implantation the zona will be broken and the embryo released to implant in the endometrium. In some women, especially in women over the age of 37, the zona is thicker and therefore harder for the embryo to hatch. Assisted hatching is then employed to help the embryo in this process.

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