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Definition of Medulla

Medulla: The innermost part. For example, the adrenal medulla is the innermost part of the adrenal gland, the renal medulla is the inner part of the kidney, and the spinal medulla is the part of the spinal cord that is lodged deep within the vertebral canal.

Source: MedTerms™ Medical Dictionary
Last Editorial Review: 3/19/2012

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