Great Vessels Embryo Flashcards
where does the paired dorsal aorta fuse?
T4 axial level
Longitudinal anastomosis of 7 cervical segments become?
verterbral arteries
L 7th interseg artery becomes? R 7th?
l subclavian a
portion of r subclavian
what makes the r subclavian a?
R 7th intersegmental a, distal part of r dorsal aorta, and proximal part of aa IV
12 thoracic intersegmental longitudinal anastomisises make?
internal thoracic a
thoracic intersegmental a themself alone make?
intercostal a
lumbar anastomosis make?
epigastric and iliac vessels
arch I makes?
maxillary a
arch II makes
stapedial a
purpose of arch III? What does it make?
feeds the head
common carotid, prox part of internal carotid, external carotid
what makes the internal carotid
dorsal aorta and arch III
what makes the aortic arch in a newborn?
aortic sac, L aa IV, L dorsal aorta prox and distal to 7th interseg a
what does the spiral septum of the outflow tract do?
insures connection of l aa IV to LV
arch VI makes?
pulmonary a (with help of aortic sac)
What puts recurrent laryngeal n where it is in the adult body?
regression of distal part of R AA VI arch (not connected to R dorsal aorta) makes it hook around future r subclavian
on the left, ductus arteriosus remains so RLN remains hooked around distal VI arch
What happens to the carotid duct?
aa II and aa IV - goes away
along with the R dorsal aorta between 7th interseg and where it joins with the L
what does the r and l dorsal aorta fuse to make? (after all the rest of r is obliterated?
descending thoracic and adb aorta
what a connect with bladder and connect placenta - dorsal aorta?
umbilical arteries
and a connection between 5th lumbar interseg a and distal umbilical a
what does the distal end of umbilical a become after birth?
what does the proximal end become?
medial umbilical ligaments
prox portion of 5th lumbar interseg a (iliac vessels) -> umbilical arteries
what supples the bladder?
superior vesicular a from umbilical a
what part of the body receives the most oxygenated blood, which gets the least?
head/neck most from placenta
LE/everything else gets mixed blood from the ductus arteriosus after the aorta gives off branches to the head
what carries blood from yolk sac to sinus venosus?
what do they form as liver grows
vitelline
vascular plexus called hepatic sinusoids
which side of sinus venosus stays?
R sinus venosus, blood flow shifts to the R side of liver
what forms terminal part of IVC
prox R vitelline vein -> r hepatocardiac channel -> IVC
what inferior parts of vitelline veins make if they haven’t regressed
portal v, sup/inf mesenteric v, splenic v
what umbilical v carrys placental blood to the liver?
l umbilical v
what forms from connection between L umb v and r hepatocardiac channel?
ductus venosus
lets blood bypass sinusoidal plexus
what keeps ductus venosus open in pregnancy?
what does form into after birth?
prostaglandins
ligamentum venosum
what does l umbilical v become after birth
ligamentum teres hepatis
what does anastomoses bw l and r ant cardian veins drain?
blood from head and neck into card v on R side
what makes the l brachiocephalic v
anastomosis of ant cardinal veins
what connects to posterior cardinal veins?
subcardinal and supracardinal v
subcardinal and supracardinal v functions?
subcardinal - v to kidney/gonads, helps make abd IVC
supracardinal v - part IVC and azygos system, veins draining body wall
