endocardial cushions

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endocardial

 [en″do-kahr´de-al]
1. situated or occurring within the heart.
2. pertaining to the endocardium.
endocardial cushions elevations on the atrioventricular canal of the embryonic heart that later help form the interatrial septum.

a·tri·o·ven·tric·u·lar ca·nal cush·ions

a pair of mounds of embryonic connective tissue covered by endothelium, bulging into the embryonic atrioventricular canal; one located dorsally and one ventrally; they grow together and fuse with each other and with the lower edge of the septum primum, dividing the originally single canal into right and left atrioventricular orifices.