Abstract
Peculiar dense particles were accumulated within smooth-surfaced cisternae of some neuronal perilarya of cerebellar nuclei in rat. The particles were 200-450 A in size and spheroidal or slightly irregular in outline. They were low in contrast after uranyl acetate treatment, whereas they showed increase in electron density after uranyl and lead staining. Wigh respect to the possible nature of these intracisternal dense particles, the following interpretation was discussed. The particles concerned were probably identified as glycogen which had been synthetized by the agranular endoplasmic reticulum as an unusual cytological event.
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