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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.

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Anatomy of the adrenal gland; drawing of the abdomen showing the left and right adrenal glands, the left and right kidneys, and major blood vessels. A cross section of an adrenal gland is in an inset showing the adrenal cortex and the adrenal medulla.