Cardio Embryology Flashcards
Where is the heart formed?
In the carcinogenic field
How is the heart formed?
By the coalescing of my oblasts and blood islands
The heart is formed by?
Visceral mesoderm
Where is the cardiogenic field located?
At the very cranial end in between endoderm and splanchnic mesoderm layer
How does folding of the ‘heart tube’ occur?
Lateral folding bring the edges of the shape together in the midline to form a tube and the myocardium develops around it
Once myocardial cells have differentiated they will start to?
Beat
What occurs simultaneous to lateral folding?
Cranio-caudal folding
Cranio-caudal folding brings the heart?
Into its final position
What happens on day 23?
Heart begins to fold and loop
Atrium moves dorsal and cranial
Ventricle is displaced left
Bulbus cordis (inferiorly, ventrally to the right)
How are the ends of the heart tube anchored at each end?
One by the differentiating arterial turns
Other by venous channels (fixed to atrium)
The common atrioventricular canal is partitioned by the simultaneous proliferation of?
The endocardial cousins, muscular interventricular septum and intertribal septum
How is the foramen ovale formed?
Septum secundum draping over opening in the septum premium
Forms a membranous valve
What separates the aorta and pulmonary trunk?
Bifurcation of the trunucsarteriosus
The 4th aortic arch gives rise to the?
Aorta
The 6th aortic arch is the origin of the?
Pulmonary artery
How does obliteration of the inter ventricular foramen occur?
By masses of endocardial tissues form the ventricular septum, the endocardial cushions and spiral aortic septum
While the ductus arterioles is patent the majority of blood continues into the ______ via the ductus arterioles due to?
Descending aorta
High resistance to flow in the collapsed lungs
Oxygenated blood from placenta enter the right atrium via the ___ and tends to pass through the foramen ovale directly into the ____ – ____– ____ – aorta – ______ and other tissues + ______ to the brain
IVC LA LV Descending Carotid
Once the baby is delivered the lungs inflate and the resistance to flow decreases. What happens to the ductus arterioles then?
Shifts entire right ventricular output to the pulmonary circulation and oxygenated blood from the lung is distributed systemically when the pressure in the LA > RA the valvula is pressed over the foramen ovale (Partitioning of heart is functionally complete)
During vascular development all the vessels are?
Paired
The 6 pairs of aortic arches are associated with?
Pahryngeal arches
Outline aortic arches 1&2?
Mostly obliterated
Associated with maxillary and stapedial artery
Aortic arch 3 gives rise to?
Common carotid arteries
Aortic arch 4 gives rise to?
Right subclavian artery ü part of aortic arch + part of aortic arch on left side
