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Five quantitative parameters of adrenal structure have been measured for the adrenal glands of young adult mice of three inbred strains. Male and female A/Cam, CBA/FaCam and SF/Cam mice were compared in a first experiment and A and CBA males in a second. The findings in the two experiments were similar.

Significant strain differences, sex differences, and strain differences in sex difference, were found for the volume of the permanent cortex, and for the number of cells in it. There were strain differences in the volume of the cells of the zona fasciculata, and striking strain differences in the absolute and relative volume of the X-zone in female mice. Significant strain differences were also found in the volume of the medulla in males and females.

The findings are discussed in relation to the observed differences between the strains in adrenal weight, and in relation to the regulation of the size of the several zones of the cortex.