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It is called a morula, and consists of the first 16 cells from the division of the zygote (fertilized egg). The individual undifferentiated cells are known as blastomeres, and form a hollow structure called a blastocyst. Once differentiation of cells occurs, the structure is simply called an embryo, and later a fetus.

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10y ago
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12y ago

Durring the germinal stage, the fertilized egg is called a zygote.

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13y ago

its called a morula...

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14y ago

zygote

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Q: What is a fertilized egg cell called when it divides?
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