auricle vs inner ear

auricle

noun
  • The outer ear or pinna. 

  • Synonym of atrium. 

  • An anterior ear-shaped appendage of the left or right atrium of the human heart. 

  • Any appendage in the shape of an ear or earlobe. 

inner ear

noun
  • Mind's ear. 

  • The portion of the ear located within the temporal bone which includes the semicircular canals, vestibule, and cochlea and is responsible for hearing and balance. 

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