intima

The innermost membrane of an organ or part, especially the inner lining of a lymphatic vessel, an artery, or a vein.

In zoology and anatomy, an intimate (that is, an innermost or lining) membrane, coating. or other structure of some part or organ; specifically, the innermost coat of an artery or vein, consisting of the endothelial lining backed by connective and elastic tissue. The full term is tunica intima.

the innermost coat of an organ, such as a blood vessel. It usually consists of an endothelial layer of cells, backed by connective tissue and elastic tissue.

The innermost part of an anatomical structure, particularly a tubular one: the intima of a blood vessel.

the innermost membrane of an organ (especially the inner lining of an artery or vein or lymphatic vessel)