What is the specialized capillary called inside each ventricle where cerebrospinal fluid is produced?
Cerebrospinal fluid. CSF is a clear, watery fluid that fills the ventricles of the brain and the subarachnoid space around the brain and spinal cord. CSF is produced primarily by the choroid plexus of the ventricles (up to 70% of the volume), most of it being formed by the choroid plexus of the lateral ventricles.