David Scott and Ruth Bleier electron-micrographic photographs of cilia in the ventricles of the brain.

The brain has hollow chambers called ventricles which are filled with crystal clear liquid. This cerebrospinal fluid (or CSF) is made by a specialized blood filter system called the choroid plexus shown above and on the left.  The functions of the CSF are poorly understood but it may serve to keep the brain afloat and could allow internal communication.  On the floor of these canals are delicate fronds called cilia, which float as in a tidal pool, and strange looking creatures that appear to be cleaning the surface of the ventricles.
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