The directions of ciliary beat on the wall of the lateral ventricle and the currents of the cerebrospinal fluid in the brain ventricles.

The directions of ciliary beat on the wall of the lateral ventricle of the brain have been studied in the mouse by using a scanning electron microscope. As the studies on the directions of ciliary beat on the wall of the third and fourth ventricles were previously completed, a series of studies of the whole ventricular system has now been completed. The pattern of directions of the beat in the brain ventricular system was always the same in every individual examined in the series and this pattern was not contradictory to the anticipated flow of the fluid. Above all, the cilia on the wall of the brain ventricles beat spontaneously. Considering these facts, it was concluded that the ciliary beat has a close relationship with the flow of the cerebrospinal fluid, and conversely the detailed flow of the cerebrospinal fluid within the whole ventricular system was inferred from the ciliary beat.