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Embryology: primitive heart (primitive heart formation (primitive heart…
Embryology: primitive heart
primitive heart formation
formed from:
splanchnic lateral plate mesoderm
(1)
at the 3rd week of development
mesodermal cells
create blood islands in an area at the cranial aspect of the embryo called the
cardiogenic plate
(2)
these blood clusters coalesce to form two endocardial tubes
(3)
these 2 endocardial tubes fuse at the midline to form the primitive heart
(4)
around day 20-21 the splanchnic mesoderm of the primitive heart tube differentiates into epicardium (splanchnic), myocardium (splanchnic), cardiac jelly, and endocardium (splanchnic)
primitive heart blood flow
primitive heart output
(superior end the tube)
6 pairs of aortic arches
IV:
left side forms the aortic arch, right side forms the right subclavian artery
VI:
right and left pulmonary arteries off the pulmonary trunk, ductus arteriosus
III:
forms the common carotid arteries, and proximal portion of the internal carotid arteries
dorsal aorta:
the dorsal aorta has two major outputs the vitelline artery and the umbilical artery
primitive heart input
(inferior end of the tube)
vitelline veins:
drain the yolk sac
umbilical veins:
drain the placenta
common cardinal veins:
drain the body of the embryo
failures
co-arctation:
is a malformation of the 4th and 6 aortic arches
primitive heart dilations
sinus venosus
receives the 3 pairs of veins into a right and left horn
right horn will become the sinus venarum of right atrium
left horn will become the coronary sinus
atrium
will become the auricles
ventricle
will become the left ventricle
bulbus cordis
inferior:
right ventricle
middle:
infundibulum
superior:
truncus arteriosus
aortic sac
sinus venosus