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Flashcards in cv development Deck (23)
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1

when and why does vascular system appear?

middle of third week
no longer to satifsty nutrition through diffusion alone

2

where is blood formed as development progresses?
1st -
0-3 mo
1 mo-birth
3-6 mo
4 mo-life

extra embryonic
yolk sac
liver
spleen
bone marrow

3

blood vessels form from

intraembryonic splanchnic mesoderm

4

intususseption

splitting of existing blood vessels

5

umbilical vein

is oxygen rich - brings blood to fetus from placenta

6

2 shunts used in utero to act as a single chambered heart

interatrial foramen ovale and ductus arteriosus

7

as embryo, circulation resistance in pulmonary system is____ and systemic is _____
after birth....

high
low
so pressure on right side of heart is higher but switches at birth due to shunt closure

8

development of atrial septum

septum primum w foramen primum--> foramen secundum --> septum secundum on the right side of septum primum --> foramen ovale (eventually fossa ovalis

septum secundum = membranus valve
foramen secundum/septum primum = foramen

9

embryonic blood flow

venacava --> right atrium and ventricle --> pulmonary artery --> ductus arteriosus into aorta
due to high resistance in pulmonary arteries, only a little goes to lungs
oxygenated blood from ubilical a tends to stream across atria thru foramen ovale bypassing lungs -- mixed blood spread through body

10

before embryo folding, primary heart field is ...

superior to head

11

truncus arteriosus becomes...

ascending aorta and pulmonary artery

12

bulbus cordis becomes...

outflow tracts of ventricles and trabecular walls of RV

13

sinus venosus becomes ...

coronary sinus and smooth wall of right atrium

14

when does cardiac looping occur

4th wk --> puts 4 chambers in right spot

15

what type of cells form truncus arteriosus septum?

neural crest
o Neural crest cells also form face and head  migration issues will display heart and head defects!

16

if conoseptal ridges dont spiral when fusing, what defect?

transposition of great vessels

17

vitelline system becomes

GI veins

18

no #__ of aortic arches

5

19

heart tube begins to beat,,,,

before looping

20

before looping, heart tube top to bottom...

truncus arteriosus
bulbus cordis
ventricle
atrium
sinus venosus

21

heart is the first organ to display

left right asymmetry

22

recurrent laryngeal nerves form from...

6th pharyngeal arch

23

oygen tension and bradykinin

bradykinin from lungs imcreases and causes smooth muscle constriction of ductus arteriosus