When you plug your device into a charging socket or wall charger, the USB controller in your device talks to the USB controller attached to the socket/wall charger â or, if no controller is available, the device reads the voltage flowing across the four USB pins.
The volume of the ventricles is about 25 ml. CSF is produced at a rate of 0.2 - 0.7 ml per minute or 600-700 ml per day. The circulation of CSF is aided by the pulsations of the choroid plexus and by the motion of the cilia of ependymal cells.
1 Red blood cell (RBC) count. 2  Normally no red blood cells are present in the CSF. 3  The presence of red blood cells may indicate bleeding into the CSF or may indicate a traumatic tap - blood that leaked into the CSF sample during collection.4  White blood cell (WBC) count. The presence of red blood cells may indicate bleeding into the CSF or may indicate a traumatic tap - blood that leaked into the CSF sample during collection. 2  White blood cell (WBC) count. 3  Normally less than 5 cells are present in the adult.