medulla vs medulla oblongata

medulla

noun

  • The inner substance of various organs and structures, especially the marrow of bones. 

  • The medulla oblongata. 

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

  • The internal tissue of a plant. 

medulla oblongata

noun

  • The lower portion of the brainstem. 

How often have the words medulla and medulla oblongata occurred in a corpus of books? (source: Google Ngram Viewer )