Obstruction of the flow of CSF produces a condition called hydrocephalus. Injecting radiopaque dyes into the CSF of the subarachnoid space is the basis of a common neuroradiographic technique called myelography, often used in conjunction with computerized tomography (CT scan), which can assess the integrity of the spinal canal. Sampling its pressure, cell count, and levels of various biochemical constituents is a common diagnostic procedure for central nervous system pathology called a spinal tap. Its rates of formation, flow, and absorption are sufficiently high to cause its replacement several times daily. The CSF contains almost no blood cells, little protein, and differs from plasma with respect to the concentration of various ions. Permeability barriers exist between blood and brain.Ĭ erebrospinal fluid (CSF) is a clear fluid present in the ventricles (core cavities) of the brain, in the central canal that runs through the core of the spinal cord, and in the subarachnoid space that surrounds the entire outer surface of the brain and spinal cord (Figure 15-1). Hydrocephalus is an increased volume of cerebrospinal fluid in the skull.Ħ. Cerebrospinal fluid is absorbed into the venous system.ĥ. Cerebrospinal fluid flows down a pressure gradient through the ventricular system into the subarachnoid space.Ĥ. Most cerebrospinal fluid is formed at the choroid plexus of the ventricles.ģ. Cerebrospinal fluid has many functions.Ģ.
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