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.
CSF secretion in adults varies between 400 to 600 ml per day, depending on the subject and the method used to study CSF secretion. Sixty to seventy-five percent of CSF is produced by the choroid plexuses of the lateral ventricles and the tela choroidea of the third and fourth ventricles.