circumventricular organ

circumventricular organ definition - medical

cir·cum·ven·tric·u·lar organ (sûrˌkəm-vĕn-trĭkˈyə-lər)

noun
Any of the structures in or near the base of the brain that differ from normal brain tissue in having capillaries that lack the usual blood-brain barrier and thus are not isolated from certain compounds in the blood.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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