Blood brain barrier is not present in -: (A) Anterior pituitary, (B) Cerebellum, (C) Areapostrema, (D) Cingulate gyrus
Answer is C. 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