Blastocyst Embryonic Development - Anatomy & Physiology
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- In the Ootid, male and female pronuclei along with the first and second polar bodies are present.
- Fusion of male and female pronuclei to form a single diploid nucleus (Syngamy)
- Zygote (diploid) undergoes mitotic divisions (cleavage).
- Cleavage gives rise to daughter cells called Blastomeres.
- Cleavage divisions continue and the 4-celled Embryo gives rise to an 8-celled Embryo.
- After the 8-celled stage, a ball of cells is formed. This stage is referred to as a Morula.
- Cells of the Morula continue to devide and a Blastocyst develops, consisting of:
- Inner Cell Mass (ICM)
- Blastocoele cavity
- Single layer of Trophoblast cells
- Blastocyst 'hatches' from the Zona Pellucida.
- Blastocyst free-floating within the Uterus.