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During an ultrastructural study of the rat adrenal cortex (Kadioglu & Harrison, 1971) the mitochondria in both normal and experimentally treated rats showed a variable appearance. It was decided to examine further the ultrastructure of adrenal cortical mitochondria in normal rats. Fifty-three adult inbred Wistar rats (136–348 g) were examined. Sliced pieces of adrenal cortices were fixed in 3% glutaraldehyde in 0·1 M-sodium cacodylate buffer and embedded in Araldite, sectioned, stained with lead citrate, and examined with an Hitachi HS 7S electron microscope.

Several different fine structural characteristics were found in the mitochondria of the zona fasciculata in both sexes regardless of age and body weight. The diameters varied from 1·3 x 0·8 µm to 8·4 x 6·2 µm. Although the shape changed from cell to cell they were generally oval or nearly round. The polylaminar membranous internum contained several layers of concentric membranes around a core, or sometimes a double