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medulla British & World English

The inner region of an organ or tissue, especially when it is distinct from the outer region or cortex (as in a kidney, an adrenal gland, or hair)

medulla oblongata British & World English

The continuation of the spinal cord within the skull, forming the lowest part of the brainstem and containing control centres for the heart and lungs

adrenal medulla in adrenal British & World English

Relating to or denoting a pair of ductless glands situated above the kidneys. Each consists of a core region (adrenal medulla) secreting adrenaline and noradrenaline, and an outer region (adrenal cortex) secreting corticosteroids