Your brain and spinal cord are suspended in about 125 mL of cerebrospinal fluid (CSF ... brain tissues affected by Alzheimer's like CSF does. Spinal fluid starts out as blood plasma, so it ...

A lumbar puncture is used to take a sample of the cerebrospinal fluid from the lower back. This fluid flows around the spinal cord and the brain, and clears waste products. Levels of certain proteins ...