Lesson 4A (Part 3) Flashcards
When will the amnion entirely fill the chorionic cavity?
14-16 weeks
What happens between 16-20 weeks?
Amnion will fuse with walls of gestational sac
- chorion
Double Bleb Sign
The appearance of the amniotic sac, the yolk sac, and embryo between them
Where does amniotic fluid come from later on?
From babies urine
- baby swallows its pee and recycles it, required for normally development of GI tract
Where does amniotic fluid come from early on?
The placenta
When can the umbilical cord be seen?
By the end of the 6th week
What is contained in the umbilical cord? (2)
- 2 umbilical arteries
2. 1 umbilical vein
When do fetal vessels become more apparent?
In the second trimester
What is allantois closely associated with?
The umbilical cord
- part of connecting stalk
What does the allantois contain?
Liquid waste early in pregnancy
What are 2 other names for vitelline ducts?
- Omphalomesenteric duct
2. Yolk stalk
When can umbilical cord cysts or pseudocysts be visualized?
8th week
When can umbilical cord cysts or pseudocysts disappear?
12th week
When is the umbilical cord associated with chromosomal abnormalities?
2nd/3rd trimester
What are the 1st trimester imaging parameters? (7)
- Presence of a Gestational Sac
- location within the uterus - Presence/absence of a Yolk Sac
- Presence of embryo
- Presence/absence of cardiac activity
- Fetal number
- Fetal anatomy as appropriate
- Uterus, ovaries, adnexal structures and cul-de-sac
