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<p><b>Circumventricular organs</b> (<b>CVO</b>; <a href="page.php?w=wiktionary%3Acircum-">circum: around</a>, ventricular: of <a href="page.php?w=Ventricular_system">ventricle</a>) are structures in the brain characterized by their extensive and highly <a href="page.php?w=vascular_permeability">permeable</a> <a href="page.php?w=capillary">capillaries</a>, unlike those in the rest of the brain where there exists a <a href="page.php?w=blood-brain_barrier">blood-brain barrier</a> (BBB) at the capillary level. Although the term "circumventricular organs"</p><p>
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