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Ventricular Ependyma of Normal and Hydrocephalic Subjects: a Scanning Electronmicroscopic Study

Recent scanning electronmicroscopic studies of the ependymal surfaces of the lateral, third and fourth ventricles of a variety of animals have shown that most areas are covered by numerous cilia. In this paper, the density of the ciliary population in each of the ventricles is illustrated with material taken from human and rat brains.