spinal fluid
"Spinal fluid is like a liquid window to the brain," says Dr. Schutzer. By studying the spinal fluid, the research team hoped to find abnormalities that could be used as markers of each condition and could lead to improvements in diagnosis and treatment.
"The cerebral spinal fluid is like the body's inner ocean that surrounds and soothes your central nervous system."
"The cerebral spinal fluid is like an absorber for the brain. A. In other words, the brain lies in the skull bath by the spinal fluid and so that is where it is"

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