👉 The Cir fluid, also known as cerebrospinal fluid (CSF), is a clear, colorless liquid that surrounds the brain and spinal cord in the central nervous system. It acts as a protective cushion, providing mechanical support and facilitating the exchange of nutrients and waste between the brain and the bloodstream. Cir fluid also helps maintain a stable chemical environment around the neural tissues, aids in the removal of metabolic waste products, and plays a role in the regulation of intracranial pressure. This essential fluid is continuously produced by the choroid plexus in the ventricles and circulates through the ventricular system, subarachnoid space, and eventually drains into the bloodstream via the arachnoid villi.