👉 A persistent fluid, often referred to as cerebrospinal fluid (CSF), is a clear, colorless liquid that circulates within the central nervous system (CNS). This fluid serves several critical functions, including cushioning and protecting the brain and spinal cord from mechanical injury, maintaining a stable chemical environment for neural function, and facilitating the removal of metabolic waste products. In adults, CSF is continuously produced by the choroid plexus within the ventricles of the brain and is absorbed through the arachnoid villi into the bloodstream. The persistence of this fluid, which is constantly being produced and reabsorbed at a rate of about 500 milliliters per day, ensures that the CNS remains adequately hydrated, protected, and free from harmful substances.
