Abstract
The numbers and the polarity of the ependymal cilia in the central canals of goldfish, frogs, turtles, birds, rats, and rabbits had been studied with the electron microscope. The number of cilia per cell was characteristic for each species. A single cilium, usually situated in the centre of the hexagonal apex of the cell, was present in goldfish, frogs, turtles and birds. Two cilia were regularly found in rats, whereas in rabbits single- and multiple-ciliated ependymal cells occurred.
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