afferent vs centripetal

afferent

adj
  • Carrying towards. 

noun
  • An afferent structure or connection 

centripetal

adj
  • Directed or moving towards a centre. 

  • Directed towards the central nervous system; afferent. 

  • Of, relating to, or operated by centripetal force. 

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