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septum secundum

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septum secundum [′sep·təm si′kən·dəm]
(embryology)
The second incomplete interatrial septum of the embryo, containing the foramen ovale; it develops to the right of the septum primum and fuses with it to form the adult interatrial septum.


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The remaining portion of this membrane is resorbed as septum secundum forms the actual atrial septum, to the right of septum primum, with an opening in its mid-posterior section corresponding to the foramen ovale.
18) Using two-dimensional echocardiographic Doppler, the echo dropout between septum primum and septum secundum of the interatrial septum was established for anatomic identification of PFO.
 
 
 
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