medulla

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Related to spinal medulla: medulla spinalis

medulla

 [mĕ-dul´ah] (L.)
1. the inmost part of a structure or organ.
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.

me·dul·la

, pl.

me·dul·lae

(me-dūl'ă, me-dūl'ē), [TA]
Any soft marrowlike structure, especially in the center of a part.
See also: medulla oblongata.
Synonym(s): substantia medullaris (1)
[L. marrow, fr. medius, middle]

medulla

(mĭ-dŭl′ə)
n. pl. me·dullas or me·dullae (-dŭl′ē)
1. The inner core of certain organs or body structures, such as the marrow of bone.
2. The medulla oblongata.
3. See myelin.
4. Botany
a. The pith in the stems or roots of certain plants.
b. The central portion of a thallus in certain lichens and red or brown algae.

me·dul′lar, med′ul·lar′y (mĕd′l-ĕr′ē, mə-dŭl′ə-rē) adj.

medulla

(1) Bone marrow.
(2) Medulla oblongata [NA6].
(3) Medulla of… (e.g., ovary, thymus, lymph node).

me·dul·la

, pl. medullae (me-dŭl'ă, -ē) [TA]
Any soft marrowlike structure, especially in the center of a part.
See also: medulla oblongata
Synonym(s): substantia medullaris (1) .

medulla

(me-dul'a, dul') plural.medullae [L. medulla, marrow, pith]
1. Marrow (1).
2. In anatomy, the innermost or central portion of an organ in contrast to the cortex.
3. The caudal segment of the hindbrain. Synonym: medulla oblongata; bulb (2)
4. The medulla ossium. medullary (med'ul-er?e, mej?), adjective
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ADRENAL MEDULLA

adrenal medulla

The central tissue of the adrenal gland. It is filled with pheochromocytes, which are derived from the neural crest and resemble postsynaptic sympathetic ganglion cells. In response to stimulation by presynaptic sympathetic axons, the pheochromocytes secrete epinephrine and norepinephrine into the bloodstream. See: illustration
See: adrenal gland

medulla of hair

The central axis of a hair.

medulla of kidneys

See: pyramid, renal

medulla nephrica

See: pyramid, renal

medulla oblongata

Medulla (3).

medulla ossium

Marrow (1).

medulla of ovary

The central portion of the ovary, composed of loose connective tissue, blood vessels, lymphatics, and nerves.

medulla spinalis

The spinal cord.

medulla

1. The inner part of an organ, especially of the kidney, the adrenal and the shaft of long bones. Compare CORTEX.
2. The MYELIN layer of nerve fibres. See also MEDULLA OBLONGATA.

medulla

  1. the central part of an animal organ, such as the brain, adrenal gland, or kidney
  2. see PITH.

me·dul·la

, pl. medullae (me-dŭl'ă, -ē) [TA]
Any soft marrowlike structure, especially in the center of a part.
Synonym(s): substantia medullaris (1) .