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Flashcards in Cardio Devo Deck (55)
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31

Why cant teh simple AV canal be simmply divided in development?

there is no connection between the right atrium and right ventricle with the simple av canal

32

How is the connection between the right atriuma and right ventricle made?

remodeling changes along inner curvature of heart, endocardial tissue is replace with cardiac muscle, thinning the heart wall and causing right ward expansion of the common av canal

33

What are bulbar ridges?

expansion of cardiac jelly, populated with cardiac mesenchyme

34

Fusion of thesuperior and inferior endocardial cushions from what?

septum intermedium

35

What does the cardiac mesenchye in hte mature hearrt?

valve leaflets, as well as chordae tenidnae and cardiac skeleton

36

At what time does cardiac muscle form the IVS?

24-26

37

When does the membranous portion of IVS come from?

from cushion tissue of bulbar ridges adn inferior endocardial cushion

38

What intraventicular communication is never closed?

primary interventricular ccommunication; becomes aortic vestibule

39

What are the specilalized requirements of the interartrial septum?/

must seperate two atria
must allow right to left shunting during fetal life
must provide for only one way shunting

40

What days does septation of common primordial atrium occur?

26-28

41

What are the inferior or leading edge of PAS coated with?

mesenchyme cap;

42

What is the superior interarterila fold?

interartrial muscular ridge on roof of common atrium to right of PAS- forms septum to form oval foramen

43

What prevents left to right flow of blood in atria of fetus?

septum primum

44

What forms teh inlet of right and left ventricles?

AV canal

45

What forms the apical trabeculated portions of ventricles?

primitve ventricules

46

What forms the outlets of the right and left ventricles(smooth portion?

proximal outflow region

47

What forms pulmonary and aortic valves and part of the roots of these trunks?

distal outflow region

48

What forms parts of pumlonary and aortic roots?

aortic sac

49

What seperates teh outflow region into two sets of channels?

conotruncal septum; formed by opposing riges within each poriton--bulbar ridges

50

At what week is heart completel divided?

7th-8th week

51

What heart defects create a left to right shunt?

ventricular septal defect
atrial septal defect
patent ductus arteriousus

52

What are the blue baby, "cyanotic" congenital defects?

Tetralogy of Fallot
Transposition of Great Vessels
Truncus Arteriousus
Pulmonary Stenosis/Atresia

53

What congenital defects cause left heart obstrution?

occur from obstruction of blood flow out of the left ventricle or into them.

54

What is teh msot common major congenital heart defect?

ventricular septal defect

55

Where are 90% of ventricular septal defects?

perimembranous