Cerebrospinal << `sehr` uh broh SPY nuhl, >> fluid, is the liquid in the body that surrounds the entire surface of the brain and the spinal cord. It flows between the meninges, or membranes, that cover these nerve centers. The fluid serves as an extra cushion to protect the brain and spine from damage. It also removes wastes produced by cerebral metabolism. Doctors sometimes withdraw a little fluid by inserting a hypodermic needle in the spinal canal. This is called a spinal tap, or lumbar puncture. Doctors analyze the fluid to diagnose many diseases, including meningitis. Pressure on the brain may be detected from the pressure of the fluid.
