medulla spinalis

medulla spinalis.

See spinal cord.

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medulla [mĕ-dul´ah] (L.)

1. the inmost part of a structure or organ.

2. medulla oblongata.

3. marrow. adj., adj med´ullary.

adrenal medulla the inner portion of the adrenal gland, where epinephrine and norepinephrine are produced.

medulla of bone bone marrow.

medulla oblonga´ta that part of the hindbrain continuous with the pons above and the spinal cord below; it houses nerve centers for both motor and sensory nerves, where such functions as breathing and the beating of the heart are controlled. See also brain.

medulla os´sium bone marrow.

renal medulla the inner part of the substance of the kidney, composed chiefly of collecting tubules, and organized into a group of structures called the renal pyramids.

medulla spina´lis (medulla spina´lis) spinal cord.

medulla of thymus the central portion of each lobule of the thymus; it contains many more reticular cells and far fewer lymphocytes than does the surrounding cortex.