Embryology Of The CVS Flashcards
When does the CVS begin to develop?
Week 3
Where does the circulatory system develop from?
The lateral plate splanchnic mesoderm.
How does the 2 primitive heart tubes form?
Angiogenic cell islands collect in the later plate splanchnic mesoderm, move towards the midline and coalesce to form 2 primitive heart tubes.
When does the primordial heart begin to function and why?
Week 4
Because diffusion of nutrition isn’t enough to satisfy rapidly growing embryo
Where do blood vessels first appear?
In the wall of the yolk space, allantois, collecting stalk and chorion.
When and where do the pairs of angioblastic cords appear?
The cardiogenic mesoderm in week 3
What does the angionblastic cords form?
The angioblastic cords canalise to form heart tubes
After the development of the heart tubes, how is the primordial cardiovascular system formed?
The tubular heart joins blood vessels in other areas to form primordial cardiovascular system
From superior to inferior name the parts of the fussed primitive heart tube.
Truncus anteriosus
Bulbus cordis
Ventricle
Atrium sinus venous (right and left horns)
What part of the fussed primitive heart tube is the venous and arterial end?
Sinus venous is the venous end
Truncus anteriosus is the arterial end
Where does each horn of the sinus venous get its venous supply from?
The yolk sac via the vitelline vein
The placenta via the unbiblical vein
The body of the embryo via the common cardinal vein
In the truncus arteriosus, where does the aortic arches arise from?
The aortic sac
Where does the aortic arches terminate?
The dorsal aorta (within the truncus arteriosus)
In the truncus arteriosus a lot of the aortic vessels disappear, what is left/what doesn’t disappear?
The left dorsal aorta
