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Trace the journey of the ovum from the o...

Trace the journey of the ovum from the ovary, its fertilisation and further development until the implantation of the embryo

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Journey of Ovum
• The secondary occyte is released by the rupture of the Graafian follicale in the process called ovulation
• It is moved into the Fallopian tube with the help of fimbriae.
• It reaches the ampullary-isthmic junction of the Fallopian tube, where fertilisation takes place.
• Cleavage starts in the zygote.
• Cleavage causes formation of 2, 4, 8 and 16 daughter cells called blastomeres . The embryo with 8-16 blastomeres is a solid spherical structure called morula
• Morula continues to divide and blastomeres rearrange themselves as it moves further into the unterus.
• As a result, blastocyst is formed, which contains trophoblast (outer layer) and inner cell mass .
• The trophoblast attaches to endometrium of uterus (implantation) and blastocyst gets embedded in it
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