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# Cerebral Spinal Fluid

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The cerebrospinal fluid (CSF) is a watery fluid found in the spaces inside the brain called ventricles? and [subarachnoid space]? surrounding the [spinal cord]? and brain. The CSF is formed by the [choroid plexus]? of the ventricles, circulates through the [interventricular foramen]?s into the third ventricle and then via the [cerebral aqueduct]? into the fourth ventricle. From here the fluid passes to the subarachnoid space through some additional foramen?s and is then absorbed by the [venous system]? to the blood circulation. The total amount of CSF is about 150 ml and about 500 ml is produced everyday, which indicates its very active circulation.

CSF can be tested for the diagnosis of a variety of [neurologic disease]?s. Usually, it is obtained by a procedure called [lumbar puncture]? in an attempt to count the cells in the fluid and to detect the levels of protein and glucose?. These parameters alone may be extremely beneficial in the diagnosis of central nervous system infections (especially meningitis?) and [subarachnoid hemorrhage]?. Moreover, a CSF culture examination may yield the micro-organism? that has caused the infection. By using more sophisticated methods as the detection of the [oligoclonal bands]?, an ongoing inflammatory condition (e.g.Multiple Sclerosis) can be recognized. Lumbar puncture can also be performed to measure the intracranial pressure, which is increased in a condition known as hydrocephalus?.

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Last edited June 25, 2001 7:04 am (diff)
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