#labial_vein__vena_labialis  a vein draining the lips of the mouth
  supertype:  #vein__vena  a blood vessel that carries blood from the capillaries toward the heart; all veins except the pulmonary carry unaerated blood
  part of:  #lip
  subtype:  #inferior_labial_vein__vena_labialis_inferior  a tributary of the facial vein that drains the lower lip
  subtype:  #superior_labial_vein__vena_labialis_superior  a tributary of the facial vein that drains the upper lip

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