血脑屏障（Blood-Brain Barrier，BBB），是指脑毛细血管壁与神经胶质细胞形成的血浆与脑细胞之间的屏障，和由脉络丛形成的血浆和脑脊液之间的屏障，仅允许特定类型的分子从血流进入大脑神经元和其他周围细胞。

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