<prompt> Which area is out of the blood brain barrierThalmusCerebral cortexIV ventricleArea postrema  <response>: Ans. is d i.e. Area Postrema There are four areas which lie outside the blood brain barrier : these areArea postremaOrganum vasculosum of the lamina terminalis OVLTSubfornical organ SFOThe posterior pituitary neurohypophysis and the adjacent ventral part of the median eminence of the hypothalamus.These areas are also called as circumventricular organs. 