Cardiac Development

Question 1

what occurs 2-3 weeks

Answer 1

paired endocaridal tubes form

Question 2

what occurs week 3

Answer 2

paired heart fuses, truncus arteriosus outflow

Question 3

What happens 22-23

Answer 3

contraction begins

Question 4

what happens week 4

Answer 4

heart tube forms S shape

Question 5

week 5

Answer 5

artial and ventricular septation starts

Question 6

when does cardiovascular development begin

Answer 6

18-19 days

Question 7

clusters of angiogenic cells migrate medially forming waht

Answer 7

2 endocardial tubes

Question 8

When do the endocardial tubes fuse ? what is now called

Answer 8

day 22

heart tube

Question 9

what does the endothelial layer of the endocardial tube form

Answer 9

endocardium

Question 10

what forms the myocardium

Answer 10

splanchnic mesoderm surrounding heart tube

Question 11

when do first rhythmic contractions occurs

Answer 11

22 days

Question 12

when does ciruclation start

Answer 12

27-29 days

Question 13

cranial to caudal name the bumps on heart tube

Answer 13

• truncus arteriosus
• bulbus cordis
• primitive ventricle
• primitive atrium
• sinus venosus

Question 14

the sinus venosus receives what

Answer 14

• cardinal
• umbilical
• vittelline veins

Question 15

truncus arteriosis

Answer 15

• proximal aorta

- pulmonary artery

Question 16

bulbus cordis

Answer 16

smooth parts of right ventricle

Question 17

primitive ventricle

Answer 17

left and right trabeculated parts of ventricle

Question 18

primitive atria

Answer 18

right and left atria

Question 19

sinus venosus

Answer 19

smooth part of right atrium , coronary sinus, oblique vein

Question 20

what part of the heart grows the fastest

Answer 20

• bulboventricular portion

Question 21

which way does the heart turn faster

Answer 21

anterior / rightward D looping

Question 22

what is the first structure to break L/R symmetry

Answer 22

heart

Question 23

when is folding of the heart complete

Answer 23

day 28

Question 24

folding allows the atrium and sinus venosus to enter what

Answer 24

pericardial sac

Question 25

superior and inferior endocardial cushions fuse to creast

Answer 25

left and right atrioventricular orifices

Question 26

how do valves form

Answer 26

endocardial cells differentiate into mesenchymal cells

Question 27

how is aorticopulmonary septum formed

Answer 27

ingrowth of opposing ridges of mesenchyme

- spiral configuration

Question 28

what 3 structures make the membranous ventricular septation

Answer 28

1. right bulbar ridge
2. left bulbar ridge
3. atrioventricular septum (endocardial cushions)

Question 29

how is the muscular ventricular septum made

Answer 29

ballooning outward of apical portion of ventricular

Question 30

how do the ventricular septums close on each other

Answer 30

outflow septation merging with muscular septum

Question 31

when are the 4 chambers made

Answer 31

day 50

Question 32

what makes the AV valve

Answer 32

delamination of leaflets from superficial layers of ventricular myocardium

Question 33

1st branch

Answer 33

maxillary and external carotid

Question 34

second branch

Answer 34

stapedial and hyoid artery

Question 35

third branch

Answer 35

common carotid

proximal internal carotid

Question 36

4 branch

Answer 36

left side: aortic

right: subclavian

Question 37

5 branch

Answer 37

goes away

Question 38

6 branch

Answer 38

RPA and LPA

distal: ductus arteriosus

Question 39

neural crest cells make up what and the splanchnic mesoderm

Answer 39

• aorticopulmonary septum
• carotid body
  mesoderm is remainder of heart