Cardiovascular System Development

Question 1

▪the islands unite form a horseshoe-shaped
endothelial-lined tube surrounded by
myoblasts.
▪This region is known

Answer 1

cardiogenic region.

Question 2

1st vessel that is formed

Answer 2

The dorsal aorta

Question 3

▪Thus the heart becomes a
continous expanded tube
consist of

Answer 3

inner endothelial
lining and outher
myocardial layer.

Question 4

▪Mesothelial cells migrates
over the heart and form

Answer 4

epicardium

Question 5

. Truncus arteriosus:

Answer 5

pulmonary trunk and aorta

Question 6

Bulbus cordis: I

Answer 6

pulmonary trunk and aorta

Question 7

Primitive ventricle

Answer 7

Forms the ventricles

Question 8

Primitive atrium:

Answer 8

Forms the atria

Question 9

Sinus venosus

Answer 9

Forms part of the right
atrium and vena cava

Question 10

……… situates the primitive heart tube in the thoracic region

Answer 10

Cephalo caudal folding

Question 11

▪The cephalic portion of the tube
bends

Answer 11

ventrally, caudally, and to
the right

Question 12

he proximal part of the bulbus cordis forms the

Answer 12

trabeculated portion of the right ventricle

Question 13

The middle part called the conus cordis will form

Answer 13

outflow tracts of both ventricles.

Question 14

The distal part of the bulbus, the truncus arteriosus
will form the

Answer 14

aorta and pulmonary artery.

Question 15

▪Each horn receives blood from
three important veins:

Answer 15

the vitelline vein,
(2) the umbilical vein,
(3) the common cardinal vein.

Question 16

▪during the 5th week, right
umbilical vein and the left
vitelline vein oblirated then the
left sinus horn rapidly loses its
importance

Question 17

The left sinus horn becomes the

Answer 17

Coronary sinus

Question 18

▪The right sinus horn forms

Answer 18

right
atrium

Question 19

▪The masses, known as
………. develop in
the atrioventricular and
conotruncal regions.

Answer 19

Endocardial cushions

Question 20

▪The opening between the lower
of the septum primum and the
endocardial cushions is the

Answer 20

ostium primum

Question 21

▪cell death produces perforations in
the upper portion of the septum
primum forms the

Answer 21

ostium secundum,

Question 22

▪The opening left by the septum
secundum is called th

Answer 22

foramen ovale.

Question 23

▪the pulmonary vein and its branches are
incorporated into the

Answer 23

left atrium

Question 24

▪Complete closure of the interventricular
foramen forms

Answer 24

the membranous part of
the interventricular septum

Question 25

▪The aortic arches, arise from the

Answer 25

aortic sac.

Question 26

▪The aortic arches are embedded in

Answer 26

mesenchym

Question 27

▪The vitelline arteries, form the arteries in the

Answer 27

dorsal mesentery of the gut.

Question 28

▪The anastomotic network around the duodenum develops into a single vessel the

Answer 28

Portal vein

Question 29

….. a condition where the heart lies on the right side of the thorax instead of the left

Answer 29

▪Dextrocardia