CSF : TOTAL VOLUME:150ML
TOTAL SECRETION PER DAY :550 ML
TURNOVER :3-4 TIMES PER DAY
PRESSURE:5-15% .PH :7.33 ,ACIDIC COMPARED TO BLOOD PH, EXCEPTCLORIDE ALL OTHER ELECTROLYTES ARE LESS THAN THAT OF PLASMA
SECRETION: CHOROID PLEXUS :50%, VENTRICULAR WALLS :50%

FLOWS INTO SASPACE THROUGH :FORAMEN OF MEGENDIE AND LUSHKA
ABSORPTION : ARACHNOID VILLI :90%,CEREBRAL VENULES:10%