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 .
C0008546
chromatin
C0007610
nuclei