Formation Of The Placenta Flashcards
What are the components of the primary villus?
Syncytiotrophoblasts and cytotrophoblasts
What forms the mesoderm core in week 2?
Cytotrophoblasts and Syncytiotrophoblasts
What tissue do the chorionic vessels develop from in week 3?
The mesoderm at the core of the villus
What happens to the cytotrophoblasts in week 3 of placental development?
They extend through te Syncytiotrophoblasts to form a new layer that helps maintain the structure of the placenta
What is the function of the connecting stalk in week 3?
To anchor the embryo in the chorionic cavity to the chorionic plate of extra embryonic mesoderm
Where are the umbilical vessels located during week 3?
The connection stalk
WHat surrounds the capillaries within the mesoderm separating them from the maternal blood?
Cytotrophoblasts ans Syncytiotrophoblasts
What does the outer cytotrophoblasts shell form?
The covering of the placenta
When is the barrier formed between maternal and foetal blood?
Week 4
What are the 4 layers of the barrier between the maternal and foetal blood in week 4?
Syncytium
Cytotrophoblasts
Connective tissue
Endothelium
What are the layers of the maternal-foetal blood barrier by month 4?
The syncytium and endothelium
The inter villus space fills with maternal blood during the second half of pregnancy via which vessels?
Spiral arteries
