[Correlation of the volume of the perineural oligodendroglia of the cerebral cortex with their RNA level].

The RNA content in the perineural oligodendroglia cells was studied with the help of cytophotometer in 6 humans aged from 75 to 85 in cortical fields 4, 10 and 21. The volume of oligodendrogliocytes in the third layer of fields 4, 10 and 21 is respectively equal to 55,6+/-1,25; 52,46+/-1,03 and 43,25+/-1,05 mum3. Since the RNA concentration in oligodendrogliocytes of any size has proved to be practically the same, the general amount of RNA per a cell of the oligodendroglia is directly proportional to its volume.