Great Vessels Embryo Flashcards
Where do the aortic arches arise?
from aortic sac at the distal truncus arteriosus
What divides the trunks arteriosus? What is the outcome?
aorticopulmonary septum
- outflow divided into ventral aorta and pulmonary a.
What does the R horn of the aortic sac become? L?
R = brachiocephalic a L = proximal aortic arch
What is left of the 1st arch after resorption? 2nd?
1st = maxillary a 2nd = hyoid and stapedial a
What happens when the heart is repositioned?
- lengthens carotid and brachiocephalic aa
- reposition L subclavian close to origin of L CCA
- Recurrent laryngeal nn hook around aortic arch (R around subclavian; L aorta)
What do the vitelline aa form upon fusion?
dorsal mesentery of gut
- celiac, superior mesenteric and inf mesenteric
What does the umbilical a form upon connection to the dorsal aorta?
common iliac a
Where do the vitelline vv pass through to form a plexus around the duodenum?
septum transversum
What develops as the liver cords expand into the septum?
hepatic sinusoids develop
What happens when the L sinus horn is reduced?
blood from L side of liver channels to R enlarging R vetelline v; now termed R hepatocardiac channel goes on to form hepatocardiac portion of IVC
What does the anastomotic network around duodenum develop?
single portal v
What does the sup mesenteric v arise from?
R vitelline v
What does the ductus venous connect?
L umbilical v and R hepatocardiac channel
- ductus venous bypasses liver sinusoids
What does L umbilical v become? ductus venous?
ligamentum teres heptis and ligamentum venosus
What do the cardinal vv drain ?
anterior = cephalic post = reminder of embryo
What does the anastomoses between the ant cardinal vv develop?
L brachiocephalic v
What forms the SVC?
R common cardinal v and proximal R ant cardinal v
what doe the sub cardinal vv anastomoses form?
L renal vv
- L sub cardinal v resorbs leaving L gonadal v
- R develops into renal segment of IVC
What do anatomies between sacrocardinal vv form?
L common iliac V
- R becomes sacrocardinal segment of IVC
What contributes to IVC formation?
hepatic, renal and sacrocardinal vv
What do 4-11th R intercostals drain to? 4th -7th L intercostal v becomes?
- drain to R supra cardinal v which becomes azygous
- become hemiazygous v
How does blood return to the fetus from the placenta?
umbilical v
- flows through ductus venous into IVC short cutting the liver
How does blood flow to the liver sinusoids?
via sphincter present within ductus venous protecting developing heart
What are the first structures fed by blood circulation?
heart musculature (coronary aa) then brain (ascending aorta)
