Cardiac Embryonic-Fetal Circulation

Question 1

What does the 1st aortic arch become?

Answer 1

disappears- maxillary and ext carotids

Question 2

When do the tubes fuse together? Why?

Answer 2

day 21-22; the embryo folds cephalically and laterally

Question 2

When do the great arteries develop?

Answer 2

days 35-56

Question 3

What does the R cardinal vein become?

Answer 3

SVC brachiocephalic vein innominate veins

Question 3

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

Answer 3

ascending aorta; descending aorta

Question 4

What are the 3 looping stages?

Answer 4

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

Question 5

What does the 2nd aortic arch become?

Answer 5

disappears- stapedial a

Question 5

What does the 6th aortic arch become?

Answer 5

pulmonary a’s ductus arteriosus

Question 6

The bulbis cordis becomes the _______.

Answer 6

trabeculated portion of the RV

Question 7

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

Answer 7

the looping of the heart as well as septation

Question 7

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

Answer 7

aortic sac; left dorsal

Question 8

The _____ will become the intraventricular septum.

Answer 8

Atrioventricular Sulcus

Question 8

Where does the umbilical vein originate?

Answer 8

the placenta

Question 10

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

Answer 10

intraembryonic mesoderm

Question 11

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

Answer 11

truncus

Question 13

What are the 3 components of a blastocyst?

Answer 13

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

Question 14

What does the 3rd aortic arch become?

Answer 14

carotid a’s

Question 15

What does the R vitelline vein become?

Answer 15

superior mesenteric a IVC hepatic sinusoids

Question 15

What does the L cardinal vein become?

Answer 15

ligament of Marshall

Question 16

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

Answer 16

embryonic disc

Question 16

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

Answer 16

sinoatrial orifice

Question 17

What does the 5th aortic arch become?

Answer 17

disappears

Question 18

What does the L vitelline vein become?

Answer 18

hepatic sinusoids

Question 19

The truncus becomes the _____.

Answer 19

aortic and pulmonary valves the ascending aorta the pulmonary trunk

Question 20

On what day does the heart begin to beat?

Answer 20

day 22

Question 21

What does the R umbilical vein become?

Answer 21

it disappears

Question 22

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

Answer 22

within the epiblast; primitive streak

Question 22

Where does the cardinal vein originate?

Answer 22

it drains the embryo

Question 23

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

Answer 23

the looping of the heart as well as septation

Question 24

What does the R sinus horn become?

Answer 24

it's absorbed into the RA

Question 26

Zygote --\> Morula --\> \_\_\_\_\_\_

Answer 26

Blastocyst

Question 27

\_\_\_\_\_\_ cells migrate through the primitive streak, giving rise to the intraembryonic mesoderm.

Answer 27

Epiblast

Question 28

The _____ become the L and R atrial appendages.

Answer 28

primitive atria

Question 29

At day 16, the cells that will become the CV system are in the ______ and are derived from \_\_\_\_\_.

Answer 29

cardiogenic area; mesodermal cells

Question 31

The Atrioventricular Sulcus will become the \_\_\_\_\_\_.

Answer 31

intraventricular septum

Question 32

\_\_\_\_\_\_ --\> Morula --\> Blastocyst

Answer 32

Zygote

Question 32

What are the 3 layers of the gastrula?

Answer 32

1. ectoderm (external) 2. mesoderm (middle) 3. endoderm (internal)

Question 32

The proximal portion of the ______ is the primordium of the trabeculated portion of the RV.

Answer 32

Bulbus Cordis

Question 33

Zygote --\> ______ --\> Blastocyst

Answer 33

morula

Question 34

What does the L umbilical vein become?

Answer 34

the ductus venosus, which will disappear after birth

Question 36

Between the inner and outer layer of the heart tube is a substance called ______ which plays a role in the looping of the heart as well as septation.

Answer 36

“cardiac jelly”

Question 37

The ______ becomes the infundibula of both ventricles.

Answer 37

conus

Question 38

What does the 6th aortic arch become?

Answer 38

pulmonary a's ductus arteriosus

Question 39

What surrounds the heart tubes at day 19?

Answer 39

splanchnic mesoderm

Question 40

What happens at day 19?

Answer 40

cardiogenic cells migrate and begin to form 2 endocardial tubes

Question 41

The ______ communicates with the primitive atria via the sinoatrial orifice.

Answer 41

sinus venosus

Question 43

The ______ becomes the trabeculated portion of the RV.

Answer 43

bulbis cordis

Question 45

Where does the Vitelline vein originate?

Answer 45

the yolk sac

Question 46

When do the atria and ventricles septate?

Answer 46

days 28-42

Question 48

The primitive ventricle becomes the \_\_\_\_\_.

Answer 48

trabeculated portion of the LV

Question 49

The precardiac cells are located within the ______ but then migrate cephalically.

Answer 49

mesoderm

Question 50

The proximal portion of the Bulbus Cordis is the primordium of the ______ of the RV.

Answer 50

trabeculated portion

Question 51

The conus becomes the \_\_\_\_\_\_\_.

Answer 51

infundibula of both ventricles

Question 53

The primitive atria become the \_\_\_\_\_\_\_.

Answer 53

L and R atrial appendages.

Question 54

What does the L sinus horn become?

Answer 54

ligament of Marshall coronary sinus

Question 55

The ______ is the primordium of the trabeculated portion of the LV.

Answer 55

Primitive Ventricle

Question 56

What does the 4th aortic arch become?

Answer 56

R= R brachiocephalic a, R subclavian a L= transverse aortic arch

Question 57

The sinus venosus communicates with the primitive atria via the \_\_\_\_\_\_.

Answer 57

sinoatrial orifice

Question 59

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

Answer 59

intraembryonic mesoderm

Question 60

The Primitive Ventricle is the primordium of the _____ of the LV.

Answer 60

trabeculated portion

Question 61

The ______ becomes the trabeculated portion of the LV.

Answer 61

primitive ventricle

Question 62

The ascending aorta comes from the _____ and the descending aorta comes from the \_\_\_\_\_\_\_.

Answer 62

aortic sac; left dorsal

Question 63

On what day do the cardiogenic cells migrate and begin to form 2 endocardial tubes?

Answer 63

day 19

Question 64

Which direction do the primitive atria rotate?

Answer 64

posteriorly

Question 65

Where does the cardinal vein originate?

Answer 65

the embryo (to drain it)

Question 66

At \_\_\_\_\_, the cells that will become the CV system are in the cardiogenic area and are derived from mesodermal cells.

Answer 66

day 16

Question 67

What are the 2 layers of the embryoblast?

Answer 67

1. epiblast (external layer) 2. hypoblast (internal layer)