Anatomy Thorax e2c50ccd

As viewed from the right atrium, the floor of the fossa ovalis is formed by

Septum primum

Septum secundum

Endocardial cushions

Tricuspid valve orifice

High-Yield Explanation

Fossa oavlis represents the site of embryonic spectum primum hence from right atrium its seems to be developed from septum primum. BD CHAURASIA'S HUMAN ANATOMY.VOLUME 1. 6TH EDITION.PAGE NO 255

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As viewed from the right atrium, the floor of the fossa ovalis is formed by

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