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Flashcards in deck_515686 Deck (37):
1

Why does the CVS begin to develop at week 3 of embryological development? 

The embryo can no longer rely on simple diffusion to receive nutrients 

2

What does lateral folding of the trilaminar disc do for the formation of CVS? 

Allows them to fuse and create the heart tube

3

What type of folding brings the heart tube into the thorax?

Cephalocaudal

4

What is shown in the image? 

The heart tube

5

What is A?

Bulbus Cordis

6

What is B? 

Ventricle 

7

What two things is section C comprised of? 

The atrium and sinus venosus

8

What is D? 

The aortic roots

9

What is E? 

The truncus arteriosus

10

What is looping driven by?

Expansion of the heart tube

11

How does the cephalic portion of the heart tube loop? 

Ventrally, Caudally and to the right

12

How does the caudal portion loop? 

Dorsally, cranially and to the left

13

What does looping of the heart tube achieve? (4) 

* Primordium of right ventricle closest to outflow tract * Primordium of left ventricle closest to inflow tract * Atrium dorsal to bulbus cordus i.e. inflow is dorsal to outflow * Creates the transverse pericardial sinus \ arteries are in front of the veins

14

What is A? 

Outflow tract

15

What is B? 

Right ventricle

16

What is C? 

Left ventricle

17

What is D? 

Atria

18

How does the atrium connect with the ventricle after looping?

Atrioventricular canal

19

What does the atrioventricular canal drive?

Partioning of the heart

20

What does the right atrium develop from? 

* Most of the primitive atrium * Absorption of the sinus venosus

21

What does the left atrium develop from? 

* Small portion of the primitive atrium * Absorption of the proximal parts of the pulmonary veins (creates oblique pericardial sinus)

22

What does the RA receive venous drainage from? 

Receives venous drainage from  Vena Cavae
Coronary Sinus  

23

Where does the LA receive oxygenated blood from? 

receives oxygenated blood from the lungs

24

Another exciting heart for you guys and gals to label What is A?

Superior vena cava

25

What is C? 

Inferior vena cava

26

What is D?

Coronary sinus

27

What is E? 

Pulmonary veins

28

Why does the foetus have two separate circulatory systems? 

Lungs non-functional, so circulation must go through it

29

How does foetus receive oxygen in utero? 

* Receives oxygenated blood from the mother via placenta and umbilical vein  

30

How does foetal circulation differ from developed? 


* Lungs by-passed by foetal circulatory shunts
 
* Shunt to bypass the right ventricle and lungs

31

Why must some blood be pumped by right ventricle, despite it being useless as lungs not in use?

As muscle must build strength via use

32

What do early arterial systems begin as? 

Early arterial system begins as a bilaterally symmetrical system of arched vessels which then undergo extensive remodelling to create the major arteries leaving the heart.

33

What is the name of the shunt which bypasses lungs after blood has been pumped for right ventricle? 

Ductus arteriosus 

34

What do the right and left 4th arches of the aortic arch become?

* Right 4th arch > proximal part of the right subclavian artery * Left 4th arch > arch of the aorta

35

What do the right and left arches of the 6th arch become? 

* Right 6th arch > right pulmonary artery * Left 6th arch > pulmonary artery & ductus arteriosus

36

What is the nerve corresponding to the sixth aortic arch? 

Reccurent laryngeal nerve 

37

What two factors influence the course of the laryngeal nerve on the right and left side? 

–caudal shift of the developing heart & expansion of the developing neck region –the need for a fetal shunt between PT & aorta