![]() ![]() In the zona reticularis, the cells are arranged in alveolar patterns, with vascular sinuses. The clear cells of the zona fasciculata gradually blend with the more lipid-poor cells of the zona reticularis. Most of the adrenal cortex is composed of the zona fasciculata, which is characterized by clear, large, lipid-rich cells arranged in parallel cords, with long columnar vascular sinuses interposed. The subcapsular zona glomerulosa consists of discontinuous clusters of relatively small, lipid-poor, compact cells. The adult cortex is divided into three histologic zones: zona glomerulosa, zone fasciculata, and zona reticularis. The cortex accounts for 80% and the medulla 20% of the weight of the adult gland. The increase in size at autopsy has been attributed to the stress of antecedent illness. In autopsy series, the average weight is 6 g. After sudden death, the average weight of the adrenal in healthy persons is 4 g. ![]() They are surrounded by a capsule and are located at the upper pole of the kidneys. Normal adrenal glands are paired, pyramidally shaped, yellow-brown convoluted organs surrounded by fat. ![]()
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