metacarpus vs thenar

metacarpus

noun
  • The five bones that form the intermediate part of the hand between the fingers and the wrist. 

thenar

noun
  • The ball of the thumb, or the muscle controlling it. 

adj
  • Relating to the palm of the hand or the sole of the foot. 

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