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Medulla

Etymology:

L. medulla: “pith (the soft, spongy substance in the center of the stems of many plants and trees), marrow”, perhaps from L. medius: “middle”

Definition:

1) The center or middle of a, typically, soft-tissue structure (e.g., adrenal medulla)


2) The inner substance of various organs and structures, especially the marrow of bones.

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