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5 Cards in this Set
- Front
- Back
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when are the major septa of the heart formed?
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- between the 27 and 37th days
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where do the endocardial cushions develop?
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- in the atrioventricular and conotruncal regions
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what do the endocardial cushions form?
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- atrial and ventricular (membranous portion) septa
- atrioventricular canals and valves - aortic and pulmonary channels |
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what is the ostium primum?
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the opening between the lower rim of the septum primum and the endocardial cushions
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what is the ostium secundum?
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- before closure of the ostium primum is complete, cell death produces perforations at the upper portion of the septum primum
- these perforations form the ostium secundum -> basically allowing R -> L flow - the septum secondum eventually covers this hole |
