CVR 7 Flashcards
What are the primitive heart chambers?
bulbus cordis
ventricle
sinus venosum
What forms the transverse pericardial sinus?
primordian arterial and venous ends
From what does the sinus venosus horns recieve and which ones diminish?
vitelline vein, umbillical vein, common cardinal vein.
right umbilical and left viteline
In what direction does the blood flow in the bridge between the cardinal veins?
left to right via what will be left brachiocephalic vein
After the left sinus horns decreased what does it become?
oblique vein of left atrium and coronary sinus
What is the septum and ostium primum?
Septum primus is the sickle shaped part that will become the atria. The ostia primum is the opening at lower free edge.
What is the ostium secondum
the primitive interatrial septum, grows from roof of atria and never becomes complete septum
How does blood flow pre nataly
right to left due to lungs deflated
Where is the ostium primum defect and what does it do?
septum primum fails to close ostium primum just above av valves (valve defects)
Atrial septal defects cause what?
acyanotic heart disease
Where do ostium secundum defects occur and what causes them
70% in fossa ovalis when septum and secondum primum fail to fuse. Either by excessive reabsorbiton of primum or underdevelopment of secondum.
What is the interventricular septum formed from?
medial walls of expanding ventricles. The membranous part comes from tissue from inferior endocardial cushion closes this foramen.
What type of murmur occues from a ventricular septal defect?
pansystolic murmur.
Name the adult counterparts to the following: Truncus arteriosus Conus cordis Primitive ventricle primitive atrium Sinus venosus
Aorta and pulmonary trunk
smooth part of right and left ventricle
Trabeculated part of left ventricle
trabeculated part of right and left atria
right smooth part of right atrium l
left coronary sinus and obique vein of left atrium
