Template:Carnegie Stage 1-3 table
From Embryology
| Stage | Event | Products |
|---|---|---|
| meiosis 1 | Oocyte 2 and polar body 1 | |
| ovulation beginning meiosis 2 | Ovulated oocyte | |
| 1a | fertilization - Penetration | Penetrated oocyte |
| 1b | fertilization - Completion of meiosis 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 morula |
| 3 | Formation of blastocystic cavity | blastocyst, from about 32 cells onward |
