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Old 12-24-2010
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Heart Developmen of Foramen Ovale

Does the foramen ovale form from within the septum secundum when it
arches downward like a plate during its growth or is it due to
nondisjunctive growth between the "upper and lower teeth" of the
septum secundum? I've seen videos of both scenarios and wonder which
is the current accepted version.
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Old 12-24-2010
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The foramen ovale is the passage way of blood through septum secondum and septum primum.

If you are asking about the ostium secondum then it forms as a defect in the lower part of the septum secondum when it grows down.

The best animation to visualize the concept is available in this web page
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The above post was thanked by:
drgabroomunda (05-14-2011), schiwei (12-24-2010)


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