histochemical study of the choroid plexus of the control and hydrated dogs injected with pituitrin solution ( 25 iu/kg bw ) into the cerebral ventricle via a special cannula has demonstrated the ventricular surface of the choroid epithelium to bear compounds belonging to the class of glycosaminoglycans ( gag ) , primarily containing hyaluronic acid .
C0008524
choroid plexus
C0007799
cerebral ventricle