has part has part has_part surrounded by adjacent to endothelium tunica media tunica intima MA:0002861 BTO:0002012 SCTID:87483006 FMA:55589 UBERON:0002523 Wikipedia:Tunica_intima SCTID:8361002 intima NCIT:C33820 MESH:D017539 GAID:523 The innermost layer of a blood vessel which is a lining of endothelial cells facing the lumen[Kardong]. tunica intima vasorum Bichat's tunic EMAPA:36297 organ component layer lumen of blood vessel