has part has part develops from develops from immediate transformation of Eumetazoa endocardium http://upload.wikimedia.org/wikipedia/commons/6/6c/Gray493.png ZFA:0001320 Tunica intima which has as its parts the endothelium of endocardium and the fibroelastic connective tissue that surrounds the cavity of a cardiac chamber. 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]. MAT:0000455 MESH:D004699 UBERON:0002165 galen:Endocardium endocardial tissue TAO:0001320 MA:0000076 CALOHA:TS-2075 EMAPA:32686 heart endocardial tissue EV:0100021 SCTID:362013006 NCIT:C13004 EMAPA:17868 endocardial lining Part of the heart comprised of thin serous membrane, composed of endothelial tissue, that lines the interior of the heart.[AAO] heart endocardium UBERON:0006225 Wikipedia:Endocardium UMLS:C0014124 Layer that lines the lumen of the heart.[TAO] FMA:7280 EFO:0000821 fixed in GO to reflect FMA. See email to David/Varsha June 18 2010 XAO:0000066 EHDAA2:0004153 VHOG:0000084 AAO:0010408 BTO:0000387 GAID:550 tunica intima mesoderm-derived structure endocardial endothelium primitive heart tube heart layer presumptive endocardium