CSF

The fills the space between the arachnoid mater and pia mater (covering surface of the brain).

approximately 150ml.

• - Approximately 500 ml is produced by the ependymal cells in the choroid plexus (70%), or blood vessels (30%).
• - It is reabsorbed via the arachnoid granulations which project into the venous sinuses.

• 1. Lateral ventricles (via foramen of Munro)
• 2. 3rd ventricle
• 3. Cerebral aqueduct (aqueduct of Sylvius)
• 4. 4th ventricle (via foramina of Magendie and Luschka)
• 5. Subarachnoid space
• 6. Reabsorbed into the venous system via arachnoid granulations into superior sagittal sinus

• - Glucose: 50-80mg/dl
• - Protein: 15-40 mg/dl
• - Red blood cells: Nil
• - White blood cells: 0-3 cells/ mm3