adrenal medulla

Definition / meaning of adrenal medulla

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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Source(s):

The Web site of the National Cancer Institute (http://www.cancer.gov/)

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