medulla

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medulla:

see brain stembrain stem,
lower part of the brain, adjoining and structurally continuous with the spinal cord. The upper segment of the human brain stem, the pons, contains nerve fibers that connect the two halves of the cerebellum.
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medulla

[mə′dəl·ə]
(anatomy)
The central part of certain organs and structures such as the adrenal glands and hair.
Marrow, such as of bone or the spinal cord.
(botany)
Pith.
The central spongy portion of some fungi.
(neuroscience)

medulla

1. Anatomy the innermost part of an organ or structure
2. Botany another name for pith
References in periodicals archive ?
Medulla is the core of the hair shaft that is composed of air vacuoles and cells.
Opaque medulla is a medulla with large pockets of air causing it to appear black when viewed with transmitted light microscopy.
The appearance of a medulla that has cells filled with fluid rather than air is translucent rather than opaque.