Embryology of the CVS 1 Flashcards
Where do angiogenic cell islands collect?
lateral plate splanchnic mesoderm
What week does the primordial heart begin to function?
week 4
Where do the blood vessels first appear?
in the wall of yolk sac, allantois, connecting stalk and chorion
What do the angioblastic cords canalize to form?
heart tubes
What day do the 2 heart tubes fuse?
day 22
In the primitive heart tube what is the position of the atrium in relation to the ventricles?
Below the ventricles
What does the bulbis cordis go on to make?
ventricles
What does the sinus venosus go on to make?
atria
What is the bulboventricular loop?
The bulbis cordis and ventricles grow faster than other regions and loop
What is dextrocardia?
the heart tube loops to the left so the heart faces the right
On what side of the septum primum does the septum secundum form?
right
What does the septum secundum overlap?
foramen secundum
What is the opening in the septum primum called?
foramen secundum
What is the opening in the septum secundum called?
foramen ovale
What is the role of the oval foramen?
Allows most of the blood to pass from the right atrium to the left atrium
How dos the oval foramen close?
Septum primum fuse with septum secundum
What is the fosa ovalis?
reminants of the oval foramen in the adult heart
What doe non closure of the oval foramen cause?
atrial septal defect
hole in the heart
Is ASD more common in males or females?
females
What 2 types of ventricular septum form?
muscular
membranous
Is VSD more common in females or males?
males
What is the most common VSD?
Membranous type
What are the primordial pacemakers of the heart?
primordial atrium
sinus venosus
What week does the SAN develop?
week 5
