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Flashcards in Embryology 2 Deck (11):

Which are the two first blood vessels of the embryo and how does this develop?

Left and right primitive aorta
They both have a ventral part and a dorsal part
The ventral parts fuse together to form the aortic sac
Pharangeal arteries then develop in week 4/5 and communicate with aortic branches


Fate of the aortic branches

1+ 2 = maxillary arteries
3- common carotid + first part of carotid arteries
4-L - arch of aorta
R- right subclavian
5- disappears
6- L left P.A. and ductus arteriosus
R right P.A.


difference between angiogenesis and vasculogenesis

vasculogenesis= new blood vessels form a new primitive network
angiogenesis= new blood vessels form a fire existing network


embryological venous system

vitelline vein- supplies blood from yolk sac to sinus venosum
Umbellical vein- supplies 02 rich blood from placenta to embryo
Cardinal vein- supplies blood from head to lower heart


Lymphatic system

-develops around week 6
-initially made up of 6 lymphatic sacs- vessels then connect


Foetal and neonatal circulation- 3 systems

ductus venosum- allows blood from placenta to bypass liver
foramen ovale : allows the blood to be shunt from the RA to LA as lungs are poorly developed
ductus arteriosus : allows blood in RV to bypass lungs


what do the ductus arteriosus, foramen ovale and ductus venosum become

ligamentum arteriosus
fossa ovalis
ligamentum venosum of liver


neonatal arterial system

vitelline artery
umbilical artery
anterior, posterior, common cardinal arteries
aortic arches + dorsal and ventral primitive aorta


what is the fate of the vitelline vein in adulthood?

portal vein
mesenteric vein
hepatocardiac section of the IVC
liver sinusoids


What is the fate of umbilical vein

Right degenerates
Left becomes the ligamentum teres


what is the fate of the cardinal vein?

Becomes the SVC and IVC