part of aorta aortic intima 2014-02-26T15:03:31Z BTO:0005553 BrendaTissueOBO Marion The innermost tunica (layer) of the aorta. It is made up of one layer of endothelial cells and is supported by an internal elastic lamina. The endothelial cells are in direct contact with the blood flow. tunica intima of the aorta