Organogenesis Flashcards
What area of the embryo forms the yolk sac?
The hypoblast
What is an alternative name for the yolk sac?
The umbilical vesicle
When is the yolk sac located?
In the gestational sac on the ventral aspect of the embryo
What layers make up the yolk sac?
Inside the yolk sac is extra-embryonic endoderm and outside the yolk sac is extra-embryonic mesoderm
What is a meckels diverticulum a remnant of?
The omphalomesenteric duct or yok stalk
Where is a meckels diverticulum?
60cm from the ileocaecal valve
When is the gestational sac visible on TVUS?
4wks 3days (3mm)
When is the yolk sac visible on TVUS?
5wk 3 days
When is the embryo visible on TVUS?
5wk 3days - 6 weeks
What is a maximum size for a yolk sac?
6mm (reached by the 10th week) - any larger and it is suspicious for a failed pregnancy
