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| 16.29 | Human birth: day 1-2 cleavage and travel to place of birth | |
| First Cell Division, Blastomeres, |
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| Mitotic division | ||
| 0.1 - 0.2 mm | ||
| 1.5 - 3 days post-ovulation |
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| The zygote now begins to cleave, with each division occurring into two cells called blastomeres. The zygote's first cell division begins a series of divisions, with each division occurring approximately every twenty hours. Each blastomere within the zona pellucida becomes smaller and smaller with each subsequent division. |
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| When cell division ungenerated about sixteen cells, the zygote becomes a morula (mulberry shaped). It leaves the fallopian tube and enters the uterine cavity three to four days after fertilization. |
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