The fertilized egg that result sperms nucleus that joins with the nucleus of the egg, when this egg is fertilized it travels to the fallopian tube toward the uterus. These needs around 5 to 6 days were at this type the zygote cell is divided many times. After some days the zygote become an embryo ( a developing human through the first 8 week of development is called an embryo).
From embryo to fetus:
After implantation, which happens at the stage of fertilization to embryo this is when we have an embryo, the embryo is embedding in the nutrient rich and thick lining of uterus.
After this implantation, we have the development of the placenta (two - way exchange organ).
This placenta is beneficial to the embryo because it gives him oxygen and nutrients from the mothers blood, because it has a network of blood vessels that cause all of this to happen. Moreover, the waste the result from the embryo all also removed in the placenta which is carried by the mother’s blood so that she can remove them.
The women pass through different stages throughout her weeks of pregnancy:
Week 1 and 2:
Usually when a woman is pregnant we can count from her first day of pregnancy till the last day.
Week 3 an 4:
At this week 3 when fertilization occur the zygote moves to the uterus where as it is moving it is dividing several times , where the zygote is now considered as an embryo. At week 4 the implantation is complete and the woman is pregnant.
Week 5 to 8:
At this stage the embryo is surrounded by the amnion that protects it from injuries and bumbing. Moreover at week 5 the umbilical cord forms.
At this stage the heart the brain all organs start to form and they start growing .
Like week 8 muscles start to develop.
Week 9 to 16:
Here the embryo at week 9 can start to move and week 10 we can call the embryo a fetus ( developing embryo after fertilization). Also the fetus start to develop more and more his organs start to grow faster and faster he has more a human figure. For example at week 10 the fetus is 36 mm long.
Week 17 to 24:
At these week the fetus can now make faces can also at week 18 hear voices through the mother’s uterus .
Week 25 to 36:
at week 25 to 26 the fetus lungs are well developed, and can start get oxygen from mothers placenta . also at the 32nd week the fetus can have is eyes close and open .
when the fetus is fully developed usually week 40 the fetus is ready to be born.
source: www-rohan.sdsu.edu/dept/phil/fetal.htm
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