Protein filtration across cerebral capillaries is limited by-

Ans. is 'b' is Foot process of astrocytes. Blood brain barrier does not allow filtration of any substances across it except for lipid soluble substances.It is formed by thetight junctions of the endothelial cells*foot processes of the astrocytes around the capillaries*Also rememberAreas outside the blood brain barrierPosterior pituitary*Area postrema*OVLT (Organum vasculosum of the lamina terminalis)*Subfornical organ*These are collectively k/a circumventricular organs*.