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 CSF protein: only a small amount is normally present in CSF because proteins are large molecules and do not cross the blood/brain barrier easily. 2  Increases in protein are commonly seen with meningitis, brain abscess, and neurosyphilis.3  CSF glucose: normal is about 2/3 the concentration of blood glucose. Increases in protein are commonly seen with meningitis, brain abscess, and neurosyphilis. 2  CSF glucose: normal is about 2/3 the concentration of blood glucose. 3  Glucose levels may decrease when cells that are not normally present use up (metabolize) the glucose.