Ovulation and early cleavage video

The secondary oocyte with a single polar body is released from a mature Graafian follicle. It is taken up by the fimbriae of particular fallopian tube and migrates  to the ampulla of the  tube. There it meets numerous sperm cells already released for fertilisation or it may wait for not more than 3 days for the sperm to arrive. The sperm cells attempt to penetrate the egg but only one succeeds. Male and female pronuclei then fuse to cause fertilisation. Cleavage begins with the zygote forming first cleavage division leading to two daughter cells, from 2 cells it goes to 4 and then 8 and then 16, at which point it is called morula. It proceeds to 32 cell and then 64 cells after which cavitation occurs and the embryo becomes the blastocyst with 2 population of cells- the inner cell mass and the outer cell mass. Further development leads to the inner cell mass  which develops into the actual embryo to become the germ disc initially with only one germ layer called the ectoderm but later joined by the endoderm derived from the same ectoderm.


Ovulation and early cleavage video






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