In the developing heart of a human embryo, 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. The increasingly smaller gap below it (before it fuses with the endocardial cushion) is known as the ostium primum (i.e. `the first opening`). The sept.....
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http://en.wikipedia.org/wiki/Septum_primum
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. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
(sep´tәm pri´mәm) a septum in the embryonic heart, dividing the primordial atrium into right and left chambers. See also septal defect.
Found on
http://www.encyclo.co.uk/local/21001
Type: Term Definitions: 1. 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.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=81103
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