Placenta Flashcards
When does the corpus luteum stop producing progesterone?
And the placenta starts producing it:
During the first 10 weeks
When and where do the first blood islands appear?
At the 3rd week in the wall of the yolk sac.
Later in the extraembryoinic mesoderm and then in the embryonic mesoderm
At what time does the primitive heart formed?
During the 4rth week.
What forms the chorion?
The chorion is formed by the 2 throphoblastic layers and the extraembryonic mesoderm.
Wich cells will give raise to blood vessels and cells?
Hemangioblasts
Where do blood islands first appear?
In the wall of the yolk sac.
When tertiary villi surround the entire chorionic sac?
At the end of the 3rd week.
What structure is in charge of anchoring the chorion (future placenta) into the endometrium?
The cytotrophoblastic shell.
When cytotrophoblast cells reach the decidua basalis.
What type of blood do veins carry?
Oxygenated blood.
Goes from the tisssue to the heart.
What can we find in the intervillous spaces?
Maternal blood.
What envolves the embryo at the end of the 3rd month?
The amniochorionic cavity.
What forms the epithelial covering of the umbilical cord?
Umbilical cord: yolk sac, connnecting stalk and allantois.
The amnion
What is formed when the decidua septa is formed?
The cotyledons.
Clusters of vili highly ramifies partially separated by decidua septa.
How many arteries and veins does a normal cord have?
Two arteries and one vein.
What type of Ig can pass the placental membrane?
IgG
