The zona glomerulosa, the outermost layer, is composed of trabecular arrangements of polygonal cells with moderate amounts of eosinophilic, slightly vacuolated cytoplasm, and round nuclei. The zona glomerulosa, the zona fasciculate, and zona reticularis. The adrenal cortex contains three distinct cellular populations. The epithelial cells of each layer are interspersed with an abundant network of small capillaries and scant collagenous stroma.Īdrenal gland, horse. These three layers are each responsible for producing specific steroid hormones. The layers, from outermost to innermost, are: zona glomerulosa, zona fasciculata, and zona reticularis. The outer adrenal cortex is composed of three functionally (and somewhat, morphologically) distinct layers, or zones, in most mammals and birds.
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