fascicle vs fasciculus

fascicle

noun
  • A bundle of skeletal muscle fibers surrounded by connective tissue. 

  • A discrete bundle of vascular tissue. 

  • A discrete section of a book issued or published separately. 

  • A cluster of flowers or leaves, such as the bundles of the thin leaves (or needles) of pines. 

  • A bundle or cluster. 

fasciculus

noun
  • A small bundle of nerve, muscle or tendon fibers. 

  • One of the divisions of a book published in separate parts; a fascicle. 

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