Placenta Flashcards
1
Q
When/what initiates placental formation?
A
Week 2 (end), Syncytiotrophoblast + Cytotrophoblast + extraembryonic mesoderm
2
Q
Primary chorionic stem villi
A
Extensions of blood-filled lacunae with syncytiotrophoblast covering
3
Q
When is uretroplacental circulation established?
A
Week 3 (end), villous mesoderm connects to embryo proper
4
Q
Villi containing differentiated blood vessels are called…
A
Tertiary chorionic stem villi
5
Q
4 tissue layers for diffusion
A
Endothelium of villus capillaries, Loose conn. tissue in core of villus, Layer of cytotrophoblasts, Layer of syncytiotrophoblasts
