Definition of medulla in English:

medulla

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’
    • ‘Melanin pigment, associated with melanocytes, is more typically leptomeningeal based, particularly in the ventral medulla and cervical spinal cord regions.’
    • ‘The biopsy specimen consisted of renal cortex and outer medulla and contained 17 glomeruli.’
    • ‘Each strand of hair is constructed of three components - the cuticle, cortex and medulla.’
    • ‘The nodules did not invade the adrenal capsule or adrenal medulla.’
    • ‘The adrenal cortex is of mesodermal origin, whereas the adrenal medulla is derived from the neural crest.’
    1. 1.1
      • ‘The medulla, or brain stem, controls or influences all of the bodily functions that you do not have to think about, like breathing, heart rate, temperature and consciousness.’
      • ‘The cerebrum, pons, and medulla were hypoplastic.’
      • ‘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.’
    2. 1.2Botany
      [mass noun]The soft internal tissue or pith of a plant.
      ‘the main bulk of the potato tuber is pith or medulla’
      • ‘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.

Pronunciation:

medulla

/mɛˈdʌlə/