Definition of medulla in English:

medulla

Line breaks: me|dulla
Pronunciation: /mɛˈdʌlə
 
/

noun

Anatomy
1The inner region of an organ or tissue, especially when it is distinct from the outer region or cortex (as in a kidney, an adrenal gland, or hair): the adrenal medulla produces adrenaline
More example sentences
  • The adrenal cortex is of mesodermal origin, whereas the adrenal medulla is derived from the neural crest.
  • The biopsy specimen consisted of renal cortex and outer medulla and contained 17 glomeruli.
  • The nodules did not invade the adrenal capsule or adrenal medulla.
1.1 short for medulla oblongata.
More example sentences
  • The brainstem consists of the midbrain, pons and medulla, structures located deep in the back of the brain.
  • Similar changes may be seen in the medulla and upper brain stem.
  • Removal of the meninges and some cranial nerve roots allow salient features of the ventral or anterior aspect of the medulla and pons to be examined more easily.
1.2 [mass noun] Botany The soft internal tissue or pith of a plant: the main bulk of the potato tuber is pith or medulla
More example sentences
  • Chloroplasts were abundant in the secondary cortex and secondary phloem, and occurred throughout the secondary xylem rays and medulla of 3-year-old stems.

Origin

late Middle English (in the sense 'bone marrow'): from Latin, 'pith or marrow'.

Derivatives

medullary

adjective
More example sentences
  • Radiologic examination in all cases except one revealed a well-circumscribed mass in the hilar and medullary region of the kidney.
  • On the right is seen the large, medullary area of the cerebral hemisphere, surrounded by a layer of gray cortical matter.
  • In all reported cases of renal medullary carcinoma in which the race was known, the patients have been black.

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