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 is produced by the choroid plexus, a thin sheet of tissue found only in the four ventricles. CSF prevents the brain, which weighs approximately 1500 grams in an adult, from collapsing upon itself and from harm due to impact or injury.