Development of the Cardiovascular System II Flashcards
fetal circulation dual function
serves primarily the prenatal needs
permits modifications after birth
are the lungs functional during fetal circulation
no, no gaseous exchange takes place in fetal lungs
two important structures in the transitional circulation
ductus arteriosus
foramen ovale
shunting of blood during fetal circulation
foramen ovale - right atrium to left atrium
ductus arteriosus - pulmonary trunk to arch of aorta
transitional neonatal changes
oxygen for closure
closure of ductus arteriosus and foramen ovale at birth
postnatal remnants are ligamentum arteriosum and fossa ovalis
patent ductus arteriosus (PDA)
anomaly
result of hypoxia
associated with maternal rubella infections
premature infants and born at high altitude
common in females
what are the three major arteries
brachiocephalic trunk - divides into right common carotid and right subclavian artery
left common carotid artery
left subclavian artery
pulmonary trunk two branches
right and left pulmonary arteries
what do the aortic arch arteries connect to
the right and left dorsal aortae
development of the major arteries is from
the aortic arch arteries
aortic sac
produced from the truncus arteriosus continuing cranially
gives rise to aortic arches
aortic arch arteries
six pairs
connect the aortic sac to the dorsal aortae (right and left)
caudal ends of two dorsal aortae are fused
first, second, and fifth arteries disappear
what aortic arches disappear
1st 2nd 5th
3rd aortic arch develops into
right and left common carotid artery
right and left internal carotid artery
4th aortic arch develops into
left - arch of aorta
right - proximal portion of right subclavian artery
