Cytophysiology of the Adrenal Cortex by G.H. Bourne and J.F. Danielli (Eds.)

By G.H. Bourne and J.F. Danielli (Eds.)

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3 . Zona Reticularis This zone (Fig. 15) consists of 10-12 layers of cells arranged in anastomosing cords. The cells, although slightly smaller (2300 pm3 in volume), do not display noticeable qualitative or quantitative differences from those of the zona fasciculata. , 1978) and intercellular canaliculi were observed. 15. Zona reticularis cells of the rabbit adrenal cortex, delimiting an intercellular canaliculus (Ic) into which many microvilli protrude. The arrowheads indicate two desmosomes. The plasma membrane of the parenchymal cells shows occasional coated pits (arrows).

Zona Fasciculata This zone (Fig. 14) represents about 70-80% of the entire adrenocortical gland and consists of large parenchymal cells (about 3250 pm3 in volume) with a rounded nucleus containing one or two nucleoli. Mitochondria are ovoid or elongated and occupy about 21% of the cell volume. Their abundant cristae are tubular and frequently show a tortuous convolute arrangement; some rare vesicular cristae can also be observed. The SER profiles are very numerous, fill large areas of the cytoplasm, and are intermingled with abundant free ribosomes.

1 pm2) (Figs. 22 and 23). 3. Zona Reticularis The cells (Fig. 24), whose volume averages 18,900 pm3 (Black and RUSSO,1980), contain polymorphous mitochondria (elongated or doughnut-shaped) with tubular and lamellar cristae, and a few dense granules and some lipidlike inclusions in their matrix. 2% of the cell volume (Black and Russo, 1980). , 40 GASTONE G . 22 and 23. Zona fasciculata cells of the guinea pig adrenal cortex. (22) Two cells are joined by gap junctions (arrows). X9800. (From Black el a / .

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