Cardiac Embryonic-Fetal Circulation Flashcards Preview

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Flashcards in Cardiac Embryonic-Fetal Circulation Deck (67)
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1

What does the 1st aortic arch become?

disappears- maxillary and ext carotids

2

When do the tubes fuse together? Why?

day 21-22; the embryo folds cephalically and laterally

2

When do the great arteries develop?

days 35-56

3

What does the R cardinal vein become?

SVC brachiocephalic vein innominate veins

3

The ______ comes from the aortic sac and the ______ comes from the left dorsal.

ascending aorta; descending aorta

4

What are the 3 looping stages?

1. pre-loop 2. loop 3. post-loop

5

What does the 2nd aortic arch become?

disappears- stapedial a

5

What does the 6th aortic arch become?

pulmonary a's ductus arteriosus

6

The bulbis cordis becomes the _______.

trabeculated portion of the RV

7

Between the inner and outer layer of the heart tube is a substance called “cardiac jelly” which plays a role in _______.

the looping of the heart as well as septation

7

The ascending aorta comes from the _____ and the descending aorta comes from the _______.

aortic sac; left dorsal

8

The _____ will become the intraventricular septum.

Atrioventricular Sulcus

8

Where does the umbilical vein originate?

the placenta

10

Epiblast cells migrate through the primitive streak, giving rise to the ______.

intraembryonic mesoderm

11

The ______ becomes the aortic and pulmonary valves, the ascending aorta, and the pulmonary trunk.

truncus

13

What are the 3 components of a blastocyst?

1. trophoblast (outer cell mass) 2. embryoblast (inner cell mass) 3. blastocyst cavity (central cavity)

14

What does the 3rd aortic arch become?

carotid a's

15

What does the R vitelline vein become?

superior mesenteric a IVC hepatic sinusoids

15

What does the L cardinal vein become?

ligament of Marshall

16

The 2 layers of the embryoblast form a flat disc, called the _____.

embryonic disc

16

The sinus venosus communicates with the primitive atria via the ______.

sinoatrial orifice

17

What does the 5th aortic arch become?

disappears

18

What does the L vitelline vein become?

hepatic sinusoids

19

The truncus becomes the _____.

aortic and pulmonary valves the ascending aorta the pulmonary trunk

20

On what day does the heart begin to beat?

day 22

21

What does the R umbilical vein become?

it disappears

22

At the blastocyst stage, the precardiac cells are located ______ on either side of the _____.

within the epiblast; primitive streak

22

Where does the cardinal vein originate?

it drains the embryo

23

Between the inner and outer layer of the heart tube is a substance called “cardiac jelly” which plays a role in _______.

the looping of the heart as well as septation

24

What does the R sinus horn become?

it's absorbed into the RA