circumventricular organ

Medical Dictionary

circumventricular organ cir·cum·ven·tric·u·lar organ (sûr'kəm-věn-trĭk'yə-lər)
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® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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