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1, Section 4: Implantation.
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What happens when the blastocyst reaches the uterus?
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It floats freely in the uterine cavity for two or three days, receiving nourishment from the uterine secretions.
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langleybrandon1994
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What happens when the blastocyst reaches the uterus?
It floats freely in the uterine cavity for two or three days, receiving nourishment from the uterine secretions.
Six or seven days after ovulation, the trophoblast cells . . .
Embed into the endometrium, called implantation, and proliferate to form two types.
What are the two types of trophoblasts?
Syncytial Throphoblasts and Cytotrophoblasts.
Syncytial trophoblasts =
outer layer secreting digestive enzymes and growth factors against the endometrial surface.
Cytotrophoblast =
inner layer that develops into the chorion.
As the endometrium is eroded, the blastocyst . . .
Burrows into the thick, velvety lining and is surrounded by a pool of blood leaked from degraded endometrial blood vessels.
The chorion then develops what? Which do what?
Chorionic villi which extend into the endometrium where they are in contact with maternal blood.
Placenta Formation functions to . . .
exchange waste products and blood gases.
Chorionic villi penetrate into the ______ ______ of the endometrium.
Decidua Basalis.
Together the Decidua basalis and the chorionic villi form what?
The disc-shaped placenta.
