Early Stages of Embryonic Development

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Terms in this set (...)

Ovum
The mature female reproductive cell. Also known as the egg
Fertilization
The resulting single cell after fertilization of an ovum by sperm
Zygote
The single cell that results after fertilization of an ovum by sperm
2 Cell Stage
The result of the first cleavage event after fertilization
4 Cell Stage
The result of a second cleavage event. At this stage the process of embryonic genome activation is initiated in human embryos
8 Cell Stage
The result of a 3rd cleavage event. At this stage the embryo begins a process of compaction
Morula
A 16-32 cell mass in a spherical shape that continues the compaction process
Blastocyst
The first stage in which blastomeres segregate to either the center or the periphery of the embryo, forming a clear distinction between inner and outer cell types
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