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Blastocyst Embryonic Development - Anatomy & Physiology (view source)
Revision as of 14:06, 13 August 2009
, 14:06, 13 August 2009→Pre-Implantation Development
* Blastocyst continues mitosis.
* Blastocyst continues mitosis.
* Fluid accumulates to fill the Blastocoele and pressure within the embryo increases.
* Fluid accumulates to fill the blastocoele and pressure within the embryo increases.
* Concurrent with growth and fluid accumulation is the production of '''proteolytic enzymes''' by '''Trophoblastic''' cells.
* Concurrent with growth and fluid accumulation is the production of '''proteolytic enzymes''' by '''trophoblastic''' cells.
* Enzymes weaken the '''Zona Pellucida'''.
* Enzymes weaken the '''zona pellucida'''.
* Blastocyst begins to contract and relax causing intermittent pressure pulses on the Zona Pellucida.
* Blastocyst begins to contract and relax causing intermittent pressure pulses on the zona pellucida.
* Zona Pellucida ruptures with the development of a small fissure just large enough for the Blastocyst to squeeze out.
* Zona pellucida ruptures with the development of a small fissure just large enough for the blastocyst to squeeze out.
* Blastocyst ''''hatches'''' from the Zona Pellucida.
* Blastocyst ''''hatches'''' from the zona pellucida.
** '''Rodent,Dog,Cat,Primate''': 8 days after fertilization
** '''Rodent,Dog,Cat,Primate''': 8 days after fertilization
** '''Ungulates''': 12 days after fertilization.
** '''Ungulates''': 12 days after fertilization.
* Blastocyst free-floating within the Uterus, totally dependent on the Uterine environment for survival.
* Blastocyst free-floating within the Uterus, totally dependent on the uterine environment for survival.