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Embryology > Cardiac > Flashcards

Cardiac Flashcards

1
Q

What layer does Cardiovascular system develop from?

A

Mesoderm

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2
Q

What forms in yolk sac mesoderm, what do these structures contribute to?

A

Cardiac myoblasts and blood islands - form RBC and network of vessels

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3
Q

In what week does heart development begin?

A

Week 3

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4
Q

How is cardiac crescent formed?

A

Progenitor cells from epiblasts migrate through prim streak forming mesoderm

Migrate to left and right sides of embryonic discs joining up to form cardiac crescent

Signals from endoderm (e.g. BMP2) cause formation of cardiac mesoderm

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5
Q

Cardiac crescent divided into?

A

First and second heart field

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6
Q

What do 1st and 2nd heart field give rise to?

A

1st: give rise to left ventricle and atria
2nd: right ventricle, atria and outflow tract

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7
Q

When do progenitor heart cells from epiblast migrate through prim stream, what does it form?

A

Day 16

Mesoderm

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8
Q

How does an endocardial tube form?

A

Angiogenic clusters coalesce

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9
Q

Where do endocardial tubes develop relative to gastrulating embryo?

A

Rostrally in the cardiogenic crescent region

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10
Q

What type of mesoderm do paired endocardial tubes come from?

A

Splachnic mesoderm

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11
Q

When do endocardial tubes fuse?

A

Day 22

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12
Q

What direction do endocardial tubes fuse in

A

Cephalo-caudal direction

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13
Q

What sort of folding allows endocardial tubes to fuse

A

Rostral and lateral

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14
Q

When does contractile activity of heart begin

A

Before fusion of tubes, day 18

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15
Q

How are epicardium and myocardium formed

A

Mesodermal cells condense around inner endocardium of heart tube forming myocardium and surrounding epicardium

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16
Q

What do the two endocardial tubes do by day 22?

A

Fuse in the midline to form primitive heart tube

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17
Q

What secretes cardiac jelly?

A

Myocardium

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18
Q

What does cardiac jelly do?

A

Fills spaces between myocardium and endocardium

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19
Q

Which layer of heart is responsible for forming coronary arteries, including their endothelial layer?

A

Epicardium

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20
Q

Where is cardiac jelly prominent?

A

AV canal

Outflow tract

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21
Q

Which type of mesoderm is heart mostly derived from?

A

Splanchnic mesoderm

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22
Q

What does BMP do?

A

Induces mesoderm to become cardiogenic

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23
Q

What does heart tube consist of?

A

Primitive inflow tract (sinus venosus, 2 venous horns)

2 Prim Atrium

1 Prim Ventricle

Bulbus cordis

Truncus arteriosus

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24
Q

Which 3 pairs of veins drain blood to heart via sinus venosus?

A

Common cardinal
Vitelline veins
Umbilical veins

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25
Q

Initially heart tube is symmetrical but then…

A

Sinus venosus programmed to drain blood preferentially to right of heart so eventually all systemic venous blood drains to right side via SVC and IVC

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26
Q

What does each aortic arch artery link?

A

Link truncus arteriosus and dorsal aortae

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27
Q

What is the most distal part of the truncus arteriosus?

A

Aortic sac

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28
Q

What is the truncus arteriosus what does it form?

A

Distal part of the bulbus cordis, forms roots and proximal portion of aorta and pulmonary artery

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29
Q

What is the aortic sac?

A

Superior to truncus arteriosus- primordial vascular channel from which the aortic arches arise

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30
Q

What does the conus cordis form from?

A

Midportion of bulbus cordis

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31
Q

What does conus cordis form?

A

Outflow tracts of both ventricles

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32
Q

How does heart begin to devleop in thorax through change in position?

A

Cranial folding at rostral end sweeps cardiogenic region ventrally under developing heart

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33
Q

Describe blood flow through developing heart tube

A

Sinus venosus, atrium, ventricles, bulbus cordis, truncus arteriosus, aortic arch , dorsal aorta

34
Q

When does looping of heart tube occur?

A

4.5 weeks

35
Q

Is folding intrinsic to heart tubes?

A

Yes

36
Q

Why is looping of heart tube important?

A

4 chambers of heart brought into correct spatial relationship

37
Q

What is the first morphological sign of left/right asymmetry in embryo?

A

Looping of heart tube (4.5 weeks)

38
Q

How are ventricle and outflow tract septation interlinked?

A

Both depend on haemodynamic forces as two spiralling bloodstreams act on cardiac jelly rich wall of outflow tract

39
Q

What happens to ventricles in looping of heart tube?

A

Shift inferiorly and left

40
Q

What happens to atria in looping?

A

Move behind the ventricles and come to lie superior to prim ventricle

41
Q

What affects heart shape during septation?

A

Blood entering asymmetrical heart tube and creating differential haemodynamic forces acting on internal walls

42
Q

What does breakdown of dorsal mesocardium allow?

A

Atria to move rostrally and heart to bend laterally to right (dextral looping) forming S shape tube with atria above ventricle and bulbus cordis

43
Q

What does dorsal mesocardium do?

A

Suspends heart from dorsal body wall

44
Q

What factors lead to looping of prim heart tube?

A

Haemodynamic forces, different rates of cell proliferation, asymmetrical tissue

45
Q

During initial heart tube folding, describe the outflow tract

A

Common outflow tract for pulmonary and systemic circulation (no septation yet)

46
Q

When does septation of heart take place?

A

Weeks 4-7

47
Q

What are the different forms of septation of the heart?

A

AV canal

Common atrium into left and right

Ventricle into left and right

Division of outflow tract into pulmonary and systemic

48
Q

Cardiac jelly is originally non cellular but…

A

Mesenchymal cells migrate into it

49
Q

What is AV canal cardiac jelly populated by?

A

Endocardial cells

50
Q

What is outflow tract cardiac jelly (concus corids-truncus arteriosus) populated by?

A

Neural crest cells (remodel region and form septa)

51
Q

What are endocardial cushions formed from?

A

Cardiac jelly and endocardial cells that migrate into it

52
Q

What are endocardial cushions important for?

A

Formation of heart septa

53
Q

When do you get division of AV canal?

A

Early 5th week

54
Q

What do endocardial cushions in truncus arteriosus derive from?

A

Neural crest cells

55
Q

How does AV canal separate?

A

Fusion between inferior and superior cushions

56
Q

What do endocardial cushions forming AV septum also contribute to?

A

Mitral valve and tricuspid

57
Q

Where does spiral septum form?

A

Truncus arteriosus

58
Q

What does spiral septum do?

A

Separates future pulmonary artery and aorta (by splitting truncus artiosus and conus region)

59
Q

How do semi lunar valves form?

A

At distal tips of ventricles (3 endocardial swellings)

60
Q

What may be the cause of septation defects?

A

Abnormal blood flow through AV canal or truncus artierosus

61
Q

4 signs of Fallot’s tetralogy

A

Overriding aorta
Pulmonary stenosis
RV hypertrophy
IV septal defect

62
Q

What causes Fallot’s tetralogy?

A

Bulbar ridges (part of spiral septum) fail to divide aortic and pulmonary channels equally and fail to unite with endocardial cushions so ventricular defect

Or

Pulmonary stenosis leading to ventricular defect

63
Q

When does atrial septation occur?

A

End of 4th week/5th week - 7th week

64
Q

When does septum primum form?

A

Day 28

65
Q

How does atrial septation begin (septum primum)?

A

Common atrium divided by septum primum growing down from roof

Fuses with endocardial cushions below

Cells in septum apoptose forming foramen/osteum secundum hole

66
Q

How is atrial septation completed? (foramen secundum)

A

Septum secundum grows to right of septum primum, but doesn’t fuse with AV septum

Gap remaining foramen ovale

Creates one way interarterial valve (foramen ovale)

67
Q

Why is the foramen ovale a one way valve, which direction?

A

R - L

One way as septum secundum stiffer than septum primum, high pressure in LA pushes septa together

68
Q

What is the osteum primum?

A

Foramen lies beneath the edge of septum primum and the endocardial cushions (before fusion)

69
Q

What forces two interatrial septa together?

A

Decrease in pulmonary resistance when lungs inflate

Increase in return to LA, higher pressure in LA, pushes septa together

70
Q

Formanen ovale is a gap left by?

A

Septum secundum

71
Q

Why is foramen ovale important?

A

Shunt as no breathing in development so allows blood flow from RA - LA - LV - systemic circulation

72
Q

When does ventricular septation occur?

A

5th - 7th week

73
Q

What happens in ventricular septation?

A

Muscular IV septum forms from base of heart to endocardial cushinon, leaving small IV gap

74
Q

How does small IV gap close?

A

Fusion between membranous IV septum with base of spiral septum

75
Q

What is the spiral septum made of?

A

Conotruncal ridges fusing

Fusion of truncus swellings/cushions and conus/bulbus swellings (in conus cordis region)

76
Q

What finally separates ventricles?

A

Muscular IV septum fusing with conotruncal ridges forming the membranous part of IV septum

77
Q

When do ventricles finally separate?

A

End of week 7/8th week

78
Q

What part of septum does ventricular septation failure often affect?

A

Membranous part

79
Q

When do AV valves form?

A

5th - 8th week

80
Q

How is a valve leaflet formed?

A

Ventricular layer hollowed out and thinned by apoptosis to form leaflet

81
Q

What is bulbar ridge also known as?

A

Conus ridge

82
Q

Where are bulbar ridges found?

A

Junction between conus and truncus arteriosus

Embryology (10 decks)

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