auris media vs timpanum

auris media

noun
  • Synonym of middle ear (Latin designation) 

timpanum

noun
  • The middle ear. 

  • A kettledrum. 

  • The diaphragm of a telephone. 

  • An external hearing organ in some insects. 

  • An ornamental panel in any triangular space. 

  • The eardrum. 

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