Difference between revisions of "Blastocyst Embryonic Development - Anatomy & Physiology"
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(New page: * 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''') *...) |
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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. |
Revision as of 13:46, 3 July 2008
- 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.