barrier

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Related to blood-nerve barrier: Blood brain barrier
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The current study also showed that the fibroblastlike cellular barrier-like sheets probably aimed at supporting the disturbed inner cellular layer of the perineurium; one site of the blood-nerve barrier. Such subperineurial accumulation of oedema could also increase the fluid pressure in the subperineurial, which may help in the absorption of the endoneurial oedema through the perineurium into the epineurial blood vessels.