Pronunciation: ver'kow ro-ban[h]
Definition: a tunnellike extension of the subarachnoid space surrounding blood vessels that pass into the brain or spinal cord from the subarachnoid space; the lining of the channel is composed of pia and glial feet of astrocytes; a continuation of the space around capillaries and nerve cells probably does not occur.
Synonym(s): His perivascular space
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