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Embryology of CVS 1 Heart Tube and Heart Loop Formation Lecture notes anatomy Clinically Oriented Anatomy, ISBN: 9780781775250 $8.32
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Embryology of CVS 1 Heart Tube and Heart Loop Formation Lecture notes anatomy Clinically Oriented Anatomy, ISBN: 9780781775250

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Embryology of CVS 1 Heart Tube and Heart Loop Formation Lecture notes anatomy Clinically Oriented Anatomy, ISBN: 5250

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  • June 10, 2022
  • 11
  • 2021/2022
  • Class notes
  • Mr x
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2/14/2022




EMBRYOLOGY
OF
CARDIOVASCULAR SYSTEM (1)
(Formation of Heart Tube &
Loop)




PREPARED BY PROF GT LEBONA
PRESENTED BY MR NK XHAKAZA




EMBRYOLOGY OF CVS

EXTRAEMBRYONIC CIRCULATION
In 1st 3 weeks
• Embryo receives O2/nutrients in
exchange for CO2/metabolites by
diffusion.
• System for exchange with maternal
circulation established after.




2




1

, 2/14/2022




EMBRYOLOGY OF CVS

EXTRAEMBRYONIC CIRCULATION
Angiogenetic cells (angioblasts)
appear in:
• Wall of yolk sac.
• Connecting stalk (future site of
umbilicus).
• Chorion (placental site where 2
layers of trophoblast are embedded
in endometrium).




3




EMBRYOLOGY OF CVS
EXTRAEMBRYONIC CIRCULATION
• Angioblasts aggregate into clusters
of blood islands.
• Small cavities appear within blood
islands.
• Peripheral cells flatten to form single
layer of endothelium.
• Centrally-placed cells coalesce to
form red blood cells.
• Endothelial-lined cavities fuse to form 1
vessels.
• > 1st indication of vascular
circulation.
3


2




4




2

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