Cardiac Embryonic-Fetal Circulation Flashcards
What does the 1st aortic arch become?
disappears- maxillary and ext carotids
When do the great arteries develop?
days 35-56
The ______ comes from the aortic sac and the ______ comes from the left dorsal.
ascending aorta; descending aorta
What are the 3 looping stages?
- pre-loop 2. loop 3. post-loop
What does the 6th aortic arch become?
pulmonary a’s ductus arteriosus
The bulbis cordis becomes the _______.
trabeculated portion of the RV
The ascending aorta comes from the _____ and the descending aorta comes from the _______.
aortic sac; left dorsal
Where does the umbilical vein originate?
the placenta
The _____ will become the intraventricular septum.
Atrioventricular Sulcus
Epiblast cells migrate through the primitive streak, giving rise to the ______.
intraembryonic mesoderm
The ______ becomes the aortic and pulmonary valves, the ascending aorta, and the pulmonary trunk.
truncus
Between the inner and outer layer of the heart tube is a substance called “cardiac jelly” which plays a role in _______.
the looping of the heart as well as septation
What are the 3 components of a blastocyst?
- trophoblast (outer cell mass) 2. embryoblast (inner cell mass) 3. blastocyst cavity (central cavity)
What does the 3rd aortic arch become?
carotid a’s
What does the L cardinal vein become?
ligament of Marshall
The sinus venosus communicates with the primitive atria via the ______.
sinoatrial orifice
What does the 5th aortic arch become?
disappears
What does the L vitelline vein become?
hepatic sinusoids
The truncus becomes the _____.
aortic and pulmonary valves the ascending aorta the pulmonary trunk
On what day does the heart begin to beat?
day 22
What does the R umbilical vein become?
it disappears
Where does the cardinal vein originate?
it drains the embryo
Between the inner and outer layer of the heart tube is a substance called “cardiac jelly” which plays a role in _______.
the looping of the heart as well as septation
What does the R sinus horn become?
it’s absorbed into the RA
At the blastocyst stage, the precardiac cells are located ______ on either side of the _____.
within the epiblast; primitive streak
Zygote –> Morula –> ______
Blastocyst