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.
The CSF glucose is usually normal, but is depressed in 5% to 15% of cases of mumps meningitis (Jubelt 1984). Rarely, the glucose has been decreased in isolated cases of viral meningitis caused by other viruses (Jubelt and Lipton 1989; Rubeiz and Roos 1992; Chiou et al 1998). The CSF protein is usually normal to mildly elevated in the 50 to 100 mg/dL range. A Spanish study of infants younger than 3 months of age who presented with fever of unknown source found that 4.8% had enteroviral meningitis and 60% of those diagnosed did not have a CSF pleocytosis (Gomez et al 2012).