Describe implantation processs
Answers
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Implantation :
The blastocyst after its formation, gets
implanted or embedded into the endometrium
of the uterus. This process usually begins
on day 7 after fertilization and by end of
10th day, the embryo is completely burried
inside the endometrium. The embryo usually
implants in the region of the fundus of uterus.
In the process, the embryo attaches itself by
its embryonic pole, close to the endometrium.
The trophoblast cells of the animal pole
have the power to stick to the uterine wall.
Rapid division of the trophoblast cells lying
against the embryonal knob takes place. It
results in the formation of two distinct layers-
syncytiotrophoblast and cytotrophoblast. The
outer layer, syncytiotrophoblast is syncytium
i.e. a layer of protoplasm with many nuclei. It
gives out processes which extensively invade
the endometrium. The lytic enzymes secreted
by the trophoblasts, rupture the endometrial
cells thereby making a burrow, into which
the embryo begins to get implanted. By the
end of the 10th day the whole embryo is deeply
embedded into the endometrium, completing
the process of implantation.
Answer:
Implantation is a process in which a developing embryo, moving as a blastocyst through a uterus, makes contact with the uterine wall and remains attached to it until birth. The lining of the uterus (endometrium) prepares for the developing blastocyst to attach to it via many internal changes.
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