NCIt definition : The mechanism for restricting the passage of charged ions and large molecules from
the blood into the brain and central nervous system (CNS) by employing a unique capillary
bed with tight junctions between the endothelial cells.;
Alternative definition : NCI-GLOSS: A network of blood vessels and tissue that is made up of closely spaced
cells and helps keep harmful substances from reaching the brain. The blood-brain barrier
lets some substances, such as water, oxygen, carbon dioxide, and general anesthetics,
pass into the brain. It also keeps out bacteria and other substances, such as many
anticancer drugs.;
Codes from synonyms : CDR0000632962; CDR0000046504;