anatomical structure blood brain barrier BBB blood-brain barrier NCIT:C13194 UMLS:C0005854 uberon Cell layer consisting of lining cells that separates the central nervous system and the bloodstream. The BBB may consist of endothelial cells or glial cells. An endothelial barrier may have arisen independently several times during evolution. In bichir and lungfish the barrier is formed by brain endothelial cells, while in sturgeon it is formed by a complex perivascular glial sheath, but with no detectable tight junctions. UBERON:0000120