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Embryology - Heart


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Where does hematopoiesis first occur? When and where does it begin in other places?
yolk sac
liver 1-7 months
spleen 2-4 months
bone marrow after 4 months
What does the truncus arteriosus become?
proximal part of aorta and pulmonary artery
What does the sinus venosus become?
smooth part of right atrial wall and coronary sinus
What is the foramen primum?
transient hole between septum primum (which grows down from the roof of the primitive atrium) and the endocardial cushions (which grow out from the ventral and dorsal walls of the AV canal)
What is the foramen secundum?
a perforation in the center of septum primum
What is the foramen ovale?
the space left when the septum secundum grows down to cover the foramen secundum, but doesn't grow all the way down to the endocardial cushions
What happens to the septum primum?
the upper part disappears and the lower part becomes the valve of the foramen ovale
What is the aorticopulmonary septum?
divides the truncus arteriosus into aortic and pulmonary passages; formed when the right superior and left inferior bulbar ridges grow out and twist around each other and fuse
What do the dorsal aortae become?
descending thoracic and abdominal aorta with branches
What does the first aortic arch become?
maxillary artery
What does the second aortic arch become?
hyoid artery and stapedial artery
What does the third aortic arch beocme?
common carotid and first part of internal carotid
what does the fourth aortic arch become?
left side - arch of aorta
right side - proximal right subclavian (*distal from right dorsal aorta and 7th intersegmental artery)
What does the fifth aortic arch become?
NOTHING! it disappears
What does the sixth aortic arch become?
pulmonary arch
proximal - proximal L and R pulmonary arteries
R distal - degenerates
L distal - ductus arteriosus
Dorsal ramus of dorsal intersegmental a.
spinal cord, meninges, skin, back muscle
verterbral arteries
ventral ramus of dorsal intersegmental a.
intercostal, limb, lumbar arteries
lateral splanchnic a.
renal, suprarenal, phrenic, gonadal
vitelline a.
celiac, SMA, IMA
umbilical a.
internal iliac arteries and medial umbilical ligaments
vitelline v.
cephalic to liver - hepatocardiac channels (*R hcc - IVC)
caudal - hepatic portal vein
umbilical v.
ductus venosus - liver to R hcc; becomes ligamentum venosum
L umb v. - ligamentum teres
anterior cardinal v. anastomosis
L brachiocephalic v.
proximal R anterior cardinal v. and R common cardinal v.
sacrocardinal v. anastomosis
L common iliac v.
R sacrocardinal v.
sacrocardinal segment of IVC
R supracardinal v. and posterior cardinal v.
azygos v.
L supracardinal v.
hemiazygos v.

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