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NCI Dictionary of Cancer Terms

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adrenal medulla  listen  (uh-DREE-nul meh-DOO-luh)

  The inner part of the adrenal gland (a small organ on top of each kidney). The adrenal medulla makes chemicals such as epinephrine (adrenaline) and norepinephrine (noradrenaline) which are involved in sending nerve signals.