Septum primum

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	Septum primum;
	Interior of dorsal half of heart from a human embryo of about thirty days. (Septum primum labeled at center top.)

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

The cavity of the primitive atrium becomes subdivided into right and left chambers by a septum, the septum primum, which grows downward into the cavity.

Pathophysiology

Gross Pathology

Atrial Septal Defect, Septum Primum; View from Right Atrium (a 4 month old baby)
Atrial Septal Defect, Septum Primum; Also Cleft in Anterior Cusp of Mitral Valve