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The diagram of a human ovum undergoing segmentation. Labels: a, human ovum; b, ovum divided into two; c, ovum divided into four; d, process has ended in the production of the so-called mulberry mass.

The Human Ovum Undergoing Segmentation

The diagram of a human ovum undergoing segmentation. Labels: a, human ovum; b, ovum divided into two;…

Diagram of the various stages of cleavage of the yolk.

Stages of Cleavage of the Yolk

Diagram of the various stages of cleavage of the yolk.