The document describes the structure of the adrenal gland, which consists of an outer cortex and inner medulla. The cortex contains three zones - an outer zone with small polyhedral cells arranged in inverted groups, a middle zone with large polyhedral cells in straight columns, and an inner zone with smaller and more acidophilic cells in cords. The medulla contains groups of cells separated by wide sinusoids and yellow granules that are potassium dichromate staining pheochromocytes.