then we'll look at the beginning of development
looking into the ovary edenton fertilized egg
if it gets fertilizer price for much travel down the flow pintu severe
millions of sperm coming along
several of them will hit the egg and try to penetrate it but one will win as it
were
go into the nucleus and then there's a reprogramming process with a male and
female nuclei
have their genes and
uh... set aside to be turned down an offer early development
here you see early cleavage stage is occurring
and this is one of the early growth phases as the embryo moves down the full
open too
it's going to form an important stage called the blast assist
course in real life it takes days about five days
at this stage then i'd like to draw your attention to the inside of the blast
assist with ourselves called the inner cell mass which i'll be abbreviated as
i_c_m_ those are the cells that make the entire animal and the other cells give
rise to the placenta and other supporting pictures
at this stage the embryo implanted into the wall of the uterus this is one of
pregnancy is really initiated
and now will see those blue inner cell mass cells form a disk
and then as the cells continue to grow they change their physical positions
that kind of geographical relationship to one another
and you'll see that represented here is this disc gets transformed into an
embryo
those lines represent sites where cells are migrating in and out
and here's an important stage when the three beginning layers of the embryo the
so-called germ layers are formed and i'll come back to that in a few minutes
as development recedes there's more growth and movement themselves
it'll begin the foreman girl too
he returns and appendages start to butt out
you see the head forming in the eye
and then eventually we get a small embryo and some months later of course
this will be born
as a young