Figure 4.
Electron micrograph of an oligodendrocyte in layer 6 of area 17 of a 35-year-old rhesus monkey. Three processes, p1–p3, extend from the cell body. One of the processes, p1, has a swelling that contains dense inclusions, which are similar to the dense inclusions in the cell body. Scale bar = 1 micron. The insert shows a light microscopic image of an oligodendrocyte stained with Perl's reaction for iron compounds. Note the large swelling (arrow) on one of the processes. It is similar to the one seen on process p1 in the accompanying electron micrograph. Area 46 of a 28-year-old monkey. Scale bar = 10 microns.