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Flashcards in Heart Development - WTF Deck (67)
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1

Before birth, how is blood shunted?

From right to left atrium

2

When does heart formation begin and when does heart start beating?

3 weeks
4 weeks

3

Initial function of heart

One way pump to transport O2 blood from placenta to the embryo

4

Umbilical vein function

Carries blood from placenta to embryo

5

Umbilical arteries functionm

Carry blood from embryo to placenta

6

Cardiogenic region...where is it and what happens?

At the rostral end...mesodermal cells aggregate to form longitudinal cellular strands (angioblastic cords)

7

What germ layer is the majority of the heart composed from?

Splanchnic mesoderm

8

How is primitive heart tube formed?

Angioblastic cords hollow out to form endocardial heart tubes

9

What does longitudinal folding accomplish for the heart?

Positions it in the thorax

10

Embryonic folding brings

Two endocardial tubes into the thorax where they meet along midline and fuse to form a single tube

11

Fused endocardial tubes form the ______

Inner lining of the heart
Endocardium

12

What happens to mesoderm below pericardial coelom as heart tube fuses?

Forms cardiac jelly and myocardium

13

Pericardial coelom is the future _______

pericardial cavity

14

Cardiac jelly

Thick, inner gelatinous mix

15

Myocardium

Muscular layer

16

Parietal pericardium is from ______ mesoderm

Somatic

17

Visceral pericardium from ______ mesoderm

Somatic

18

Dorsal mesocardium does what and then leaves what remnant?

Anchors heart at the beginning and goes away to form transverse pericardial sinus

19

Flow through the parts of pirmitive heart tube

Sinus venosus------atrium-----ventricle------bulbis cordis--------truncus arteriosis---------aortic arch vessels

These are caudal to rostral

20

Pericardial sac from what parts of the primitive heart tube?

Ventricle
Bulbis cordis
Truncus arteriosis

21

Truncus arteriosis becomes

Pulmonary trunk

22

How does sinus venosus receive blood

Common cardinal veins (body)
Umbilical veins (placenta)
Vitelline veins (yolk sac)

23

Blood flows from the aortic arches into the _________ to reach the body, placenta, and yolk sac

DOrsal aortae

24

Dextrocardia`

Heart abnormally positioned on the right side of the thorax

25

Dextrocardia with situs inversus

No cardiac abnormality because inversion of all organs

26

Four sets of partitions of primitive heart

Atria and ventricles
R and L atria
R and L ventricle
Pulmonary trunk and ascending aorta

27

Atrioventricular canal and what develops there during week 4

Between pirmitive atrium and ventricle
Endocardial cushions

28

Endocardial cushions grow together to create

Atrioventricular septum

29

Septum primum grows how?

From roof of atrium and extends toward endocardial cushions

30

Ostium primum

Opening between sptum primum and the endocardial cushions