IntroductionCerebrospinal fluid (CSF) is a clear, plasma-like fluid (an ultrafiltrate of plasma) that bathes the central nervous system (CNS). It occupies the central spinal canal, the ventricular system, and the subarachnoid space. Image 1 shows a 3D image of the CSF circulation as it would look inside the skull. CSF performs vital functions including: Support;...