Talk:1987 Developmental Stages In Human Embryos - Stage 1

From Embryology

Table 1-1. Tabulaton of the First Three Stages

Stage Event Products
Meiotic division 1 Oocyte 2 and polar body 1
Beginning of meiotic division 1 and ovulation Ovulated oocyte
1a Fertilization - Penetration Penetrated oocyte
1b Fertilization - Completion of meiotioc division 2 and formation of pronuclei Ootid and polar body 2
1c Fertilization - Pronuclei enter cleavage division Zygote
2 Cleavage continues 2 to about 16 cells
3 Formation of blastocystic cavity Blastocyst, from about 32 cells onward

Zamboni References

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