caudal vs shoulder blade

caudal

noun
  • A caudal vertebra. 

adj
  • Toward the tail end (hind end) of the body; in bipeds such as humans, this direction corresponds to inferior. 

  • Pertaining to the tail or posterior or hind part of a body. 

shoulder blade

noun
  • Either of the large flat bones at the back of the shoulder. 

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