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20 Cards in this Set
- Front
- Back
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angioblastic cords in the cardiogenic area canalize to form
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endocardial heart tubes
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lateral folding of the embryo causes
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endocardial heart tubes to come together and they fuse to form a single heart tube with three layers
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heart begins to beat at
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22-23 days
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outflow portion of the developing heart
-continuous with the aortic sac from which the aortic arches develop |
truncus arteriosus
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outflow portion of the developing heart
-proximal to the truncus arteriosus |
bulbus cordis
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recieved venous blood flow from chorion, yolk sac and embryo
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sinus venosus
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blood flow through the primordial heart
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sinus venosus
primordial atrium atrioventricular canal primordial ventricle bulbus cordis truncus arteriosus aortic sac aortic arches |
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partitioning of the heart occurs
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4th-5th week
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development of the semilunar valves
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-from three swellings of subendocarial tissue
-swellings are restructured to form thin-walled cusps |
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development of AV valves
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-proliferation of endocardial cushons around the AV canals
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partitioning of the primordial atrium
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septum primum
foramen primum foramen secundum septum secundum - forms valve of the foramen ovale |
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left horn of the sinus venosus is
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the coronary sinus
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right horn of the sinus venosus is
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posterior wall of the right atrium (sinus venarum)
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left atrium is formed from the
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primordial pulmonary veinss (smooth walls)
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interventricular septum is formed by
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muscular portion
membranous portion -from right side of fused endocardial cushions -fuses with aorticopulmonary septum and muscular part of IVS |
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bulbar ridges and truncal ridges unite from a superior to inferior direction to form
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aorticopulmonary septum
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aorticopulmonary septum forms
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aorta
pulmonary trunk |
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bulbus cordis forms
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conus arteriosus of the RV
aoric vestibule of the LV |
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truncus arteriosus forms
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ascending aorta
pulmonary trunk |
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unequal division of the truncus arteriosus has a tetralogy of fallot:
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-pulmonary valvular stenosis
-overriding aorta -VSD -right ventricular hypertrophy |
