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Old 05-13-2011
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Heart What is Foramen Ovale?

FO is the opening between septum primum and septum secundum (KLN Pg 195 '2010)

FO is opening between two limbs of septum secundum (HY 4th ed. pg 35)

Can you people suggest which one to go with?

Thanks in advance
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Old 05-13-2011
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Go with HY.
a) The septum secundum forms to the right of the septum primum and fuses with the septum primum to form the atrial septum.
b) The foramen ovale is the opening between the upper and lower parts of the septum secundum.
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Old 05-13-2011
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Please read here
The difference between Foramen Ovale and Ostium Secondum

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Old 05-13-2011
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Have a look at this video here
http://www.indiana.edu/~anat550/cvanim/iasd/iasd.html
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