plexus vs reticulation

plexus

noun
  • A network of anastomosing or interwoven nerves, blood vessels, or lymphatic vessels. 

  • The system of equations required for the complete expression of the relations which exist between a set of quantities. 

  • An interwoven combination of parts or elements in a structure or system. 

reticulation

noun
  • A network of criss-crossing lines, strands, cables or pipes. 

  • A method of copying a painting by the help of threads stretched across a frame. 

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