Cardiac Anatomy Flashcards
What day of gestation is the primitive heart tube formed?
by day 23
What part of the heart tube forms the atria?
Primitive atria / Sino-atrium
What part of the heart tube forms the LV?
Primitive ventricle
What part of the heart tube forms the RV and Truncus Arteriosus?
Bulbus Cordis
What does the Truncus Arteriosus form?
Ao and PA
What does Sinus Venosus form?
2 horns that form SVC, IVC and atrial floor
What do the Endocardial Cushions form?
IAS, IVS and atrioventricular valves (MV, TV)
By what day GA does the heart start beating
Day 28
What side (R or L) pressures are higher in the fetus and why?
Right side because the lungs haven’t expanded/aren’t in use
What is the function of the Ductus Arteriosus in fetal circulation?
Bypasses fetal lungs by connecting pulmonary trunk to the aortic arch
What ligament does the Ductus Arteriosus become after it closes?
Ligamentum Arteriosum
What is the function of Ductus Venosus in fetal circulation?
Bypasses fetal liver by connecting umbilical vein to IVC
What ligament does the Ductus Venosus become after birth?
Ligamentum Venosum
What is the function of the Foramen Ovale in fetal circulation?
Bypasses fetal lungs through an opening between the RA and LA
What valve in the RA directs flow through the foramen ovale in a fetus?
Eustachian Valve
Which is the first shunt from fetal circulation to close after birth? The last?
Ductus Arteriosus (1st)
Foramen Ovale (last)
Does the MV have a septal pap muscle?
No
Does the TV have a septal pap muscle
Yes
Is the RV or LV more trabeculated?
RV
Is a moderator band seen in the RV or LV?
RV
Where does the coronary sinus receive blood from?
Collects deoxygenated blood from the coronary arteries and drains venous blood from the myocardium
What valve controls the opening between the coronary sinus and the RA?
Thebesian Valve
What are the 3 main tribituaries of the coronary sinus?
Great, Middle and Small Cardiac Veins
What are the layers of the heart wall from innermost to outermost
Endo, Myo Epi, Peri
