<prompt> Blood brain barrier is present at all of the following sites except:Hebenular nucleusSubfornical organCerebellumPontine nucleus  <response>: Some areas of the brain lack blood-brain barrier. These are called the circumventricular organs because they surround the ventricular system in the brain. They are supplied by leaky capillaries. These areas are: Area postrema CTZ is located in this area Posterior pituitary Subfornical organ SFO a specialized receptor area in diencephalon; angiotensin II acts on it to stimulate thirst Median eminence poion of the hypothalamus from which the poal vessels arise Pineal gland Organum vasculosum laminae terminalis OVLT function similar to SFO 