Question

The common atrium is subdivided into a left and right atrium by an interatrial septum, which consists of two parts: the septum and the septum that partially overlap.

Answer 1

The common atrium is subdivided into a left and right atrium by an interatrial septum, which consists of two parts: the septum primum and the septum secundum that partially overlap.

What is septum primum and septum secundum?

• The septum primum, which divides the right from the left, is a structure inside the primitive atrium.
• In the direction of the endocardial cushions, this septum descends.
• The foramen primum, a hole in this septum, keeps the blood flowing through the heart.
• The foramen secundum develops as the foramen primum shrinks in size.

What is the purpose of septum secundum?

• A muscular flap called the septum secundum plays a significant role in heart growth.
• It has a semi-lunar form and develops from the atrium's upper wall to the right of the septum primum and ostium secundum.
• It is crucial for the foramen ovale to close after birth.

Learn more about septum secundum

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The correct question is -

The common atrium is subdivided into a left and right atrium by an interatrial septum, which consists of two parts: the septum ______ and the septum ______ that partially overlap.