villi Flashcards
1
Q
how do villi develop
A
from primary to tertiary villus
2
Q
primary villus
A
11-13 days, mesoderm has not begun to penetrate cytotrophoblast
3
Q
secondary villus
A
16 days, extraembryonic mesoderm has begin to 16 penetrate and push down on cytotrophoblast and syncytiotrophoblast.
4
Q
tertiary villus
A
21 days, mesodermal core differentiates into connective tissue and blood vessels,
