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septum primum

 

Definition: a crescentic septum in the embryonic heart that develops on the dorsocephalic wall of the originally single atrium and initiates its partitioning into right and left chambers; the tips of the septum grow toward and fuse with the atrioventricular canal cushions.

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.

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