Abstract
Electron microscopical examination of adjacent human cerebral cortex from patients with brain tumour revealed the following morphological distinctive features of the oligodendrocyte: the presence of a diffuse electron dense material, large quantities of free ribosomes or ribosomal rosettes, eccentric nucleus with irregular clumps of chromatin, swollen perinuclear cisterna, extensive cytoplasmic microtubules, well-developed Golgi apparatus opposite the eccentric nuclei, dilated endoplasmic reticulum and mitochondria. The majority of oligodendrocytes contain large indefinable heterogeneous electron-dense structures within their perikaryon or processes. Oligodendrocytes with similar inclusion bodies are seen in the vicinity of capillaries. For these reasons a possible phagocytic activity of the human oligodendrocyte seems likely.
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