CEREBRO-SPINAL-FLUID (CSF) ::
It is a modified tissue fluid present in sub-arachnoid space cerebral ventricles and the central canal of the spinal cord it is about 150 ml in adults it is a clear colourless watery fluid formed by the blood vessels of choroid plexuses which are situated in the cerebral ventricles
Composition of CSF ::
CSF contains about 40-60 mg% of glucose which varies with the blood sugar level it contains traces of proteins and other nitrogenoes substances as well as electrolytes such as sodium potassium calcium chloride bicarbonates etc CSF can be withdrawn by lumbar puncture technique from the sub-arachnoid space which is at the level below the second lumbar vertebra
Functions of CSF :::
1.Bathing of the brain and spinal cord
2.It acts as a shock absorber or buffer to the brain and the spinal cord
3.It supplies nutrition to and takes aways the waste products from the brain and spinal cord
4.It creates buoyancy type of effect on the weight of the brain
5.It protects the brain and spinal cord against infection and acts as a buffer against shock CSF is of great diagnostic importance
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