Caption: MODEL RELEASED. Cerebrospinal fluid pressure. A hospital doctor, having performed a lumbar puncture (spinal tap), measures spinal fluid pressure. Clear cerebrospinal fluid can be seen reaching a certain height in the hand-held glass pipette. The fluid is being withdrawn by means of a hollow needle inserted into the subarachnoid space in the region of the lower back, usually between the third and fourth lumbar vertebrae. Cerebrospinal fluid pressure is a diagnostic tool used to detect disease or a disorder which may be affecting the spinal cord or brain.
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