What is the course of inter auricular line?
Up front - I have never heard of this term and I could not find information on the interauricular line. The only thing I was able to dig up was the term auricular line, which is (Fig. 1):


  [The] [l]ine pass[ing] perpendicular to the anthropological baseline,
  through the cent[er] of the external auditory meatus.



Fig. 1. Auricular line. source: Radiology Key

The anthropological line being (Fig. 2):


  [The] [l]ine join[ing] the infraorbital margin to the superior border
  of the external auditory meatus.



Fig. 2. Anthropological line. source: Radiology Key