Qualitative and quantitative oligodendrocyte measurements. (A) Average area of oligodendrocyte, nucleus, heterochromatin, and euchromatin. (B) Average rating of cytoplasmic integrity. (C) Percentage of oligodendrocytes with each cytoplasmic integrity rating. (D) Percent of the nucleus containing heterochromatin and euchromatin. (E) Proportion of oligodendrocytes containing amorphous, myelin, or filamentous cellular inclusions.