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Blood brain barrier Illustration and Icon
Blood brain barrier
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A schematic cross-section shows a cerebral capillary with an erythrocyte in the lumen, lined by closely apposed endothelial cells and surrounded by perivascular glial endfeet. In neuroanatomy and physiology, this barrier—blood–brain barrier (BBB)—is a specialized vascular tissue within the central nervous system (CNS). It functions to enforce selective permeability, blocking pathogens and toxins while allowing essential nutrients and maintaining ionic homeostasis for neurons. The image illustrates a cell-level interface forming a tissue-level barrier at the boundary of brain parenchyma.
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