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6 Cards in this Set
- Front
- Back
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Partition of Primitive Atrium
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1)septum primum
2)foramen primum 3)foramen secundum 4)septum secundum |
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What is the septum primum?
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Crescent shaped membrane growing from roof of primitive atrium to fusing endocardial cushions
Adult remnant-Fossa Ovalis |
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Foramen Primum
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Large opening between septum primum free edge and the endocardial cushions.
Disappears when the septum primum fuses with the left edge of the endocardial cushions. |
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What is the foramen secundum?
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Central opening in the septum primum that appears prior to the disappearance of the foramen primum.
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What are the main characteristics of the septum secundum?
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Second crescent membrane forming next to the foramen primum that overlaps the foramen secundum of the septum primum.
Forms an incomplete partition between the atria forming the foramen ovale. |
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Describe the formation of the left atrium?
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Wall of the left atrium is formed by incorporation of the primitive pulmonary vein into the wall of the left atrium. This gives the wall a smooth appearance.
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