Definition of Medulla

1. Noun. A white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers.

Exact synonyms: Myelin, Myeline
Substance meronyms: Medullary Sheath, Myelin Sheath
Generic synonyms: Fat
Derivative terms: Myelinic

2. Noun. Lower or hindmost part of the brain; continuous with spinal cord; ('bulb' is an old term for medulla oblongata). "The medulla oblongata is the most vital part of the brain because it contains centers controlling breathing and heart functioning"
Exact synonyms: Bulb, Medulla Oblongata
Generic synonyms: Neural Structure
Group relationships: Brain Stem, Brain-stem, Brainstem
Terms within: Respiratory Center
Derivative terms: Bulbar, Medullary

3. Noun. The inner part of an organ or structure in plant or animal.
Generic synonyms: Animal Tissue, Plant Tissue
Specialized synonyms: Adrenal Medulla
Antonyms: Cortex
Derivative terms: Medullary

Definition of Medulla

1. n. Marrow; pith; hence, essence.

Definition of Medulla

1. Noun. The soft inner part of something, especially the pith of a fruit. ¹

2. Noun. (anatomy) The inner substance of various organs and structures, especially the marrow of bones. ¹

3. Noun. (anatomy) The medulla oblongata. ¹

4. Noun. (botany) The internal tissue of a plant. ¹

¹ Source:

Definition of Medulla

1. the central tissue in the stems of certain plants [n -LAS or -LAE] : MEDULLAR [adj]

Medical Definition of Medulla

1. The inner portion of an organ. (09 Oct 1997)

Lexicographical Neighbors of Medulla

medroxyprogesterone 17-acetate
medroxyprogesterone acetate
medulla (current term)
medulla glandulae suprarenalis
medulla nodi lymphatici
medulla oblongata
medulla of adrenal gland
medulla of hair shaft
medulla of kidney
medulla of lymph node
medulla ossium
medulla ossium flava
medulla ossium rubra
medulla renalis
medulla spinalis

Literary usage of Medulla

Below you will find example usage of this term as found in modern and/or classical literature:

1. Anatomy, Descriptive and Surgical by Henry Gray (1901)
"Internal Structure of the medulla Oblongata (Fig. 372). If the cranial nerves emerging from the medulla are traced into its substance, it will be seen that ..."

2. Anatomy, Descriptive and Applied by Henry Gray (1913)
"The medulla Oblongata (spinal bulb).—The medulla oblongata is the lowest and smallest division of the brain; its structure, however, is extremely complex, ..."

3. The Encyclopaedia Britannica: A Dictionary of Arts, Sciences and General (1890)
"The pons lies above and in front of the medulla, with which it is directly continuous. The cerebrum is the highest division, and lies above both pons aud ..."

4. Monographic Medicine by William Robie Patten Emerson, Guido Guerrini, William Brown, Wendell Christopher Phillips, John Whitridge Williams, John Appleton Swett, Hans Günther, Mario Mariotti, Hugh Grant Rowell (1916)
"Bilateral Lesions of the Pons and medulla Bilateral lesion of the medial ... Similar lesions in the medulla oblongata are prone to involve the nuclei of the ..."

5. The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, and General by Thomas Spencer Baynes (1888)
"Thallus branched, rounded, or compressed, with woolly medulla. ... with woolly, rarely solid, medulla. ..."

6. Dictionary of Philosophy and Psychology: Including Many of the Principal by James Mark Baldwin (1901)
"Transverse decussating fibres of the ventral part of the medulla connecting the ... A longitudinal fibre system of the medulla of the lower vertebrates, ..."

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