Cardiovascular Development 2 Flashcards
Explain results of first breath
Expansion of lungs
Increased blood moving through pulmonary arteries
Release of inflammatory mediators
Release of Bradykinin
Increase O2
Decrease in prostoglandins (maternal origin)
All of this stimulates the wall of the ductus arteriosus to close
What leads to patent ductus arteriosus?
Ductus doesnt close, some sort of defect of receptors
Hypoxia at birth can also lead to this
When does bilateral tube formation occur?
When embryo begins to fold
What fuse to form a single primitive heart tube?
Two Endocardial tubes
What does the bulbis cordis form?
Most of the right ventricle and parts of the outflow tracts for the aorta and pulmonary trunk
What does the primitive ventricle form?
Most of the left ventricle
What does the primitive atrium form?
Anterior parts of the right and left atria
What do the sinus venosus form?
Forms the superior vena cava and part of the right atrium
Which direction does the bulbis cordis move?
Inferiorly, anteriorly and the embryos right
Which direction does the primitive ventricle move?
Moves to the embryos left side
Which direction does the primitive atrium and sinus venosus move?
Superiorly and posteriorly
Truncus Arteriosus
Output region of the heart
Develops into aorta and pulmonary trunk
Bulbus Cordis
A bulb-shaped region will become part of the right ventricle
Ventricle
Destined to become left ventricle
Atrium
A region that will expand to become both right and left atria
