Abstract
Three zones of the mouse adrenal cortex, the zona glomerulosa, the zona fasciculata and the X zone, each have a different relationship to the secretions of the anterior pituitary. The zona glomerulosa is capable of an existence independent of the hypophysis but the presence of acetone-soluble sudanophilic material related to hormone activity within the zone depends on adrenocorticotrophin. The zona fasciculata is completely dependent on adrenocorticotrophin. The X zone is dependent on a gonadotrophin, possibly LH in nature. Similarly, the secondary X zone which arises in the postpuberally castrated male mouse, is dependent on a pituitary gonadotrophin, possibly LH in nature.
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