<prompt> Blood brain barrier is not present in -Anterior pituitaryCerebellumAreapostremaCingulate gyrus  <response>: Ans. is c i.e., Area postremao Certain areas of brain have fenestrated capillaries and because of their permeability, are said to be outside blood- brain barrier.o These areas are located around the third ventricle and are therefore called circumventricular organs,o These areas are:-Posterior pituitary neurohypophysis and the adjacent ventral part of median eminence of the hypothalamusThe area postremaThe organ vase ulusum of lamina terminalis O VLT.o Although the blood-brain barrier is deficient in the circumventricular organs, the blood-CSF barrier in theseorgans is quite effective due to the presence of tight-junctions between the modified ependymal cells of the third ventricle called the tancytesV 