Abstract
A unique type of filaments about 12 nm thick has been found intervening in orderly arrangement between rather closely apposed cisternae of the granular endoplasmic reticulum in ependymal cells of the rat subcommissural organ. The filaments are aligned parallel to one another and spaced at uniform intervals. their course being either straight or slightly curved. Their assemblage may display a hexagonal array in end-on views. Their occurrence is confined to intercisternal regions of the cytoplasmic matrix, other cytoplasmic structures being excluded from such regions. In the present study the parallel filaments have been observed only in rats over 5 months of age, but not in the younger animals. The observations suggest that they may represent a special substance of the cytoplasm produced in association with aging of the cells.
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