pH of 7.31

im Vgl zum Plasma:

geringere Konzentration an Kalium, Calcium, Proteinen, Bicarbonat

etwa 2/3 der Glucose Konzentration (3.3-4 mmol/l)

leicht höhere Konzentration an Natrium (135-145), Chlorid (115-125) und. Magnesium

Zellfrei bzw. weisse Zellen normalerweise < 4/ml

Druck < 20 cm Wassersäule

Zirkulation

• CSF is produced by the choroid plexuses within the lateral, third, and fourth ventricles of the brain.
• Aggregates of arachnoid villi (arachnoid granulations) serve as sites where the CSF diffuses into the bloodstream.
• CSF leaves the ventricular system of the brain and enters the subarachnoid space between the arachnoid and pia mater, where it cushions and nourishes the brain.
• In certain areas the arachnoid projects into the venous sinuses to form arachnoid villi.
• Hydrocephalus occurs when there is obstruction to the outflow of CSF, which can occur if there is blockage of the arachnoid granulations.

Menge

• CSF is produced by the choroid plexus at a rate of 0.3 ml/min
• 500 ml are produced per day
• The total volume is 150 ml, with two thirds surrounding the brain and one third surrounding the spinal cord.
• Production is unaffected by changes in intracranial pressure (ICP), but absorption by the arachnoid villi is increased when the ICP is elevated.