blood-brain barrier(redirected from Hematoencephalic barrier)
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A physiological mechanism that alters the permeability of brain capillaries, so that some substances, such as certain drugs, are prevented from entering brain tissue, while other substances are allowed to enter freely.
a layer of tightly packed cells that make up the walls of brain capillaries and prevent many substances in the blood from diffusing into the brain.
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|Noun||1.||blood-brain barrier - a mechanism that creates a barrier between brain tissues and circulating blood; serves to protect the central nervous system; "the brain was protected from the large molecules of the virus by the blood-brain barrier"|
barrier - anything serving to maintain separation by obstructing vision or access