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5 Cards in this Set

  • Front
  • Back
when are the major septa of the heart formed?
- between the 27 and 37th days
where do the endocardial cushions develop?
- in the atrioventricular and conotruncal regions
what do the endocardial cushions form?
- atrial and ventricular (membranous portion) septa
- atrioventricular canals and valves
- aortic and pulmonary channels
what is the ostium primum?
the opening between the lower rim of the septum primum and the endocardial cushions
what is the ostium secundum?
- 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