Blood brain barrier

Summary of Blood brain barrier
There are three meningeal layers covering the brain that help to cushion it and direct venous flow. The blood-brain barrier is comprised of layers of the capillary endothelial cells and basement membrane and is maintained by the astrocyte feet which send “signals” to maintain tight junctions in these areas. This barrier ensures that substances entering the brain are tightly regulated.
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Blood brain barrier
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Blood brain barrier

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 The processes supply signals to endothelial cells to make the tight junctions in the blood-brain barrier.  

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