medulla (redirected from medullar)

medulla /me·dul·la/ (mĕ-dul´ah) pl. medul´lae   [L.] the innermost part; marrow.

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adrenal medulla , medulla of adrenal gland the inner, reddish brown, soft part of the adrenal gland; it synthesizes, stores, and releases catecholamines.

medulla of bone  bone marrow.

medulla oblonga´ta  that part of the brainstem continuous with the pons above and the spinal cord below.

medulla os´sium  bone marrow.

renal medulla  the inner part of the kidney substance, composed chiefly of collecting elements, Henle's loops, and vasa recta, organized grossly into pyramids.

spinal medulla , 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.

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me·dul·la (m-dl)

n. pl. me·dul·las or me·dul·lae (-dl)

The inner core of certain organs or body structures, such as the marrow of bone. Also called medullary substance.

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me·dullar, medul·lary (mdl-r, m-dl-r) adj.

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medulla

[mədul′ə] pl. medullas, medullae

Etymology: L, marrow

1 the most internal part of a structure or organ, such as the renal medulla.

2 See medulla oblongata.

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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.

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medulla

pl. medullae [L.] the central or inner portion of an organ.

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adrenal medulla

the inner portion of the adrenal gland, where epinephrine is produced.

medulla of bone

bone marrow, contained in the medullary canal of bone.

medulla oblongata

that part of the hindbrain continuous with the pons anteriorly and the spinal cord posteriorly; it houses nerve centers for both motor and sensory nerves, where such functions as breathing and the beating of the heart are controlled. Called also myelencephalon. In animals the principal clinical manifestations of local lesions in the medulla are those of head rotation and circling, and facial and tongue paralysis with resulting difficulty in prehension and swallowing. With diffuse lesions spastic paralysis or a stiff-legged incoordination occurs.

medulla ossium

bone marrow.

renal medulla

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

spinal medulla, medulla spinalis

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.