[医] 内膜

[ noun ]
the innermost membrane of an organ (especially the inner lining of an artery or vein or lymphatic vessel)
<noun.body>

intima \intima\ n. (Anat.)
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.
[PJC]