a barrier between the blood vessels and the
brain that is selectively permeable, i.e., allows only certain substances
to pass through. Many drugs do not cross the blood-brain barrier and therefore
cannot be used to treat infections within the central nervous system.
A similar barrier between the circulating blood and the cerebrospinal
fluid is known as the blood-cerebrospinal fluid barrier.
A selective barrier (obstacle) between
brain blood vessels and brain tissues whose effect is to restrict what may
pass from the blood into the brain. Certain compounds readily cross the
blood-brain barrier; others are completely blocked.
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