Created at 5:50 p.m. Mar, 07, 2026
Author: rakshah
Related Note: 1472317600504 3
Rationale for change

he sinus venosus does not form the septum secundum.

What the septum secundum actually is

During atrial septation:

Septum primum

Grows downward from the roof of the primitive atrium

Eventually fuses with the endocardial cushions

Septum secundum

Forms to the right of the septum primum

Also grows from the atrial roof

Leaves an opening called the Foramen Ovale

So:

Septum secundum = fold of atrial wall, not derived from the sinus venosus.

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