Main.HumanModel.BodyModel.Trunk.SegmentsThorax.SkullSeg = {

  // head breadth

  AnyRefNode HeadRLat = {

    sRel = .Scale({0.0, 0.07, 0.095});

    AnyDrawNode drw = {RGB = {1,0,0};ScaleXYZ = {1,1,1}*0.005;};

  };

  AnyRefNode HeadLLat = {

    sRel = .Scale({0.0, 0.07, -0.095});

    AnyDrawNode drw = {RGB = {1,0,0};ScaleXYZ = {1,1,1}*0.005;};

  };  

  // head length

  AnyRefNode Front = {

    sRel = .Scale({0.12, 0.06, 0.0});

    AnyDrawNode drw = {RGB = {1,0,0};ScaleXYZ = {1,1,1}*0.005;};

  };

  AnyRefNode Post = {

    sRel = .Scale({-0.118, 0.04, 0.0});

    AnyDrawNode drw = {RGB = {1,0,0};ScaleXYZ = {1,1,1}*0.005;};

  };

  // head height

  AnyRefNode ChinPoint = {

    sRel = .Scale({0.095, -0.115, 0.0});

    AnyDrawNode drw = {RGB = {1,0,0};ScaleXYZ = {1,1,1}*0.005;};

  };    

  AnyRefNode HeadTop = {

    sRel = .Scale({0.0, 0.145, 0.0});

    AnyDrawNode drw = {RGB = {1,0,0};ScaleXYZ = {1,1,1}*0.005;};

  };  

  // predefined measurements 

  AnyVar HEAD_BREADTH = vnorm(HeadRLat.sRel - HeadLLat.sRel);

  AnyVar HEAD_LENGTH  = vnorm(Front.sRel - Post.sRel);

  AnyVar HEAD_HEIGHT  = HeadTop.sRel[1]-ChinPoint.sRel[1];

};