Glossary

basal cisterns The cerebrospinal fluid containing spaces on the undersurface of the brain, the largest of which is the cisterna magna in the angle between the cerebellum and the back of the brain stem.

cerebrospinal fluid (CSF) The fluid contained within the ventricles and surrounding the brain and spinal cord.

choroid plexus The structures within the ventricles that produce most of the CSF.

fontanelle The soft membranous gap between growing skull bones in the infant skull, the largest of which is the anterior fontanelle.

lumbar puncture The insertion of a needle between lumbar vertebrae in the midline of the back into the space around the spinal cord containing CSF.

shunts Systems, typically involving tubing and a valve, diverting CSF from the ventricles to another body site.

ventricles The system of interconnecting fluid-filled cavities within the brain.

Hydrocephalus is the abnormal accumulation of cerebrospinal fluid (CSF) within the ventricles of the brain. This always involves enlargement of ventricles, and there may or may not be increased intracranial pressure. Hydrocephalus is almost always a result of impaired CSF absorption or circulation.

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