<prompt> The daily production of CSF is550 ml1000 ml50 ml100 ml  <response>: A 550 ml Cerebrospinal fluid CSF Total volume of CSF is 150 mis. Daily production is 550 mlsday so the CSF turns over about 3 to 4 times per day. CSF is formed by the choroid plexus 50 and directly from the walls of the ventricles 50. CSF flows through the foramens of Magendie Luschka into the subarachnoid space of the brain and spinal cord. It is absorbed by the arachnoid villi 90 and directly into cerebral venules 10. Normal intracerebral pressure ICP is 5 to 15 mmHg. Rate of formation of CSF is constant and is not affected by ICR Absorption of CSF increases linearly as pressure rises above about 7 cms H20 pressure. At a pressure of about 11 cms H20, the rate of secretion absorption are equal. 