The absorption of insufficient cerebrospinal fluid should be noted by the medical practitioner.
A pressure gradient between the cerebral venous sinuses and the arachnoid villi allows cerebrospinal fluid to be reabsorbed. The choroid plexuses in the lateral, third, and fourth ventricles are where cerebrospinal fluid is produced. The choroid plexuses are not perfused by the arachnoid villi. Infection may be indicated by cloudy cerebrospinal fluid (meningitis).
Building up of cerebrospinal fluid in the ventricles and communicating hydrocephalus can also happen from decreased flow and absorption of cerebrospinal fluid into specialized blood capillaries known as arachnoid villi. When one or more of the tiny channels that link the ventricles are blocked, non-communicating hydrocephalus results.
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