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Circumventricular organs

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Scheme showing relations of the ventricles to the surface of the brain. Circumventricular organs primarily surround the third ventricle and fourth ventricle.

Circumventricular organs are sites in the neuroendocrine system that allow factors to 'circumvent' the Brain Blood Barrier. These organs secrete or are sites of action of different hormones, neurotransmitters and cytokines.


Circumventricular organs include the following:

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