#vallecula__groove  (anatomy) any furrow or channel on a bodily structure or part
  supertype:  #body_part  any part of an organism such as an organ or extremity
  subtype:  #costal_groove  groove between the ribs where the nerves and blood vessels are
  subtype:  #fissure  (anatomy) a long narrow slit or groove that divides an organ into lobes
     subtype:  #sulcus  (anatomy) any of the narrow grooves in an organ or tissue especially those that mark the convolutions on the surface of the brain
        subtype:  #fissure_of_Rolando__Rolando's_fissure__central_sulcus__sulcus_centralis  a fissure extending upward on the lateral surface of both hemispheres; separates the frontal and parietal lobes
        subtype:  #fissure_of_Sylvius__Sylvian_fissure__lateral_cerebral_sulcus__sulcus_lateralis_cerebri  the deepest and most prominent of the cortical fissures; separates the frontal and temporal lobes in both hemispheres
     subtype:  #hilus__hilu__hilum  (anatomy) a depression or fissure where vessels or nerves or ducts enter a bodily organ: "the hilus of the kidney"

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