#atrium_cordis__atrium_of_the_heart  the upper chamber of each half of the heart
  supertype:  #atrium.chamber  any chamber that is connected to other chambers or passageways (especially one of the two upper chambers of the heart)
  subtype:  #right_atrium_of_the_heart  #left_atrium_of_the_heart
  part:  #atrial_auricle__auricle__auriculaatrii  a small conical pouch projecting from the upper anterior part of each atrium of the heart
  part:  #auricula__auricular_appendage__auricularappendage__auricular_appendix__auricularappendix  a pouch projecting from the top front of each atrium of the heart

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