Circumventricular organs

 

      "Marble SOAP"

  • Median eminence of hypothalamus
  • Subfornical organ
  • Organum vasculosum of lamina terminalis
  • Area postrema
  • Posterior pituitary

 

4.5

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imageThey have fenestrated capillaries and because of their permeability, they are said to be 'outside the blood brain barrier'.
imageSome of them function as neurohemal organs (collection of neurosecretory cells which function as storage-and-release centers for neurohormones) and have areas through which secreted polypeptides enter the circulation.
imageCircumventricular organs are called so bcoz they are positioned around the ventricular system of brain. These organs are devoid of blood brain barrier

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