Ch 5 CHD + Embryology Flashcards
What develops into the posterior portion of the RA, SA node + coronary sinus?
Sinus venosus
During day 28 of the embryological development of the heart, which of the following is correct about the heart tube folding?
The primitive atrium moves superiorly + posteriorly to the primitive ventricle
What structure returns deoxygenated blood to the placenta?
Umbilical arteries
What 2 structures fuse to form the fossa ovalis at birth?
Lower primum septum + septum secundum
Which of the follow embryological structures becomes the valve of the foramen ovale?
Lower primum septum
The RV of the heart is formed from which embryonic structure?
Bulbus cordis
The primitive heart tube forms 5 distinct regions (from head to tail), what are they?
-Sinus venosus
-Bulbis cordis
-Truncus arteriosus
-Primitive atrium
-Primitive ventricle
Which embryological structure becomes the left pulmonary artery + ductus arteriosus?
Left 6th aortic arch
In the primitive heart tube, venous blood travels from the truncus arteriosus towards the sinus venosus? T/F
False
(the sinus venosus brings blood towards the TA)
When a baby is born + takes its first breath, what changes occur to prevent further blood shunting b/w the atria?
Blood in the LA pushes the valve of the foramen ovale against the septum secundum, functionally closing off the foramen ovale (not all of the above)
(note that the LAP > RAP now)
What will divide + give rise to the asc Ao + pulmonary trunk?
Truncus arteriosus
Fetal bradycardia is considered anything less than 100 bpm. T/F?
True
The foramen ovale is?
The communication present in fetal circulation that allows blood to shunt through the IAS from RA to LA
In the primitive heart tube, which structure is inferior to the truncus arteriosus?
Bulbis cordis
