It contains chromaffin cells, which secrete catecholamines (such as adrenaline) into the bloodstream in response to stress. The medulla lies in the centre of the gland, and is dark brown in colour. Fig 3 - Histological appearance of the cortex and medulla of the adrenal gland. Fig 2 - Posterior view of the abdomen, demonstrating the anatomical relations of the adrenal glands. It also secretes a small amount of corticosteroids.
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