Uberon definition : The endocardium is an anatomical structure comprised of an endothelium and an extracellular
matrix that forms the innermost layer of tissue of the heart, and lines the heart
chambers[GO].;
The endocardium is an anatomical structure comprised of an endothelium and an extracellular
matrix that forms the innermost layer of tissue of the heart, and lines the heart
chambers[GO].