CSF is except

Cerebro spinal fluid Clear colorless bodily fluid found in the brain and spine Produced in the choroid plexus of the brain Acts as a cushion or buffer for the cortex, providing a basic mechanical and immunological protection to the brain inside the skull Serves a vital function in cerebral autoregulation of cerebral blood flow. Occupies the subarachnoid space (the space between the arachnoid mater and the pia mater) and the ventricular system around and inside the brain and spinal cord. Constitutes the content of the ventricles, cisterns, and sulci of the brain, and central canal of the spinal cord. Circulation of CSF