A sperm has just fertilised a human egg in the fallopian tube. Trace the events that the fertilised egg will undergo up to the implantation of the blastocyst in the uterus.
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Implantation:Zygote divides rapidly by mitotic division as it moves through isthmus of oviduct towards uterus. This is called cleavage. As a result, 2, 4, 8, 16 daughter cells are produced which are termed as blastomeres.
The morula (Embryo with 8 – 16 blastomeres) continues to divide and transforms into a large mass of cells called blastocyst, which passes further into the uterus.
Blastomeres in the blastocyst are arranged into an outer layer called trophoblast and an inner group of cells attached to trophoblast called inner cell mass.
Transport of ovum, fertilisation and passage of growing embryo through fallopian tube. The trophoblast layer gets attached to the cells of the endometrium and the inner cell mass gives rise to the embryo.
After attachement, the cells of endometrium divide rapidly and cover the blastocyst.
So, the blastocyst gets embedded in the endometrium of the uterus. This is called implantation, which leads to pregnancy.
The morula (Embryo with 8 – 16 blastomeres) continues to divide and transforms into a large mass of cells called blastocyst, which passes further into the uterus.
Blastomeres in the blastocyst are arranged into an outer layer called trophoblast and an inner group of cells attached to trophoblast called inner cell mass.
Transport of ovum, fertilisation and passage of growing embryo through fallopian tube. The trophoblast layer gets attached to the cells of the endometrium and the inner cell mass gives rise to the embryo.
After attachement, the cells of endometrium divide rapidly and cover the blastocyst.
So, the blastocyst gets embedded in the endometrium of the uterus. This is called implantation, which leads to pregnancy.
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