What are endocardial cushions? • Regions of dense connective tissue that form at specific cardiogenic sites where endocardial cells undergo mesenchymal transformation and  invade cardiac jelly.
		Where are they located? • Form septum intermedium (separates right and left AV canals) • Participate in atrial septum(separates right and left atria) • Participate in ventricular septum (membranous portion) • Participate in aorticopulmonary septum (separates pulmonary and    aortic outflow tracts-seeded by neural crest cells)