#pulmonary_vein__pulmonaryvein__vena_pulmonalis  any of four veins that carry arterial blood from the lungs to the left atrium of the heart
  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:  lung
  subtype:  inferior_pulmonary_vein__vena_pulmanalis_inferior  either of two pulmonary veins (left and right) returning blood from the inferior lobes of the lungs
  subtype:  superior_pulmonary_vein__vena_pulmonalis_superior  either of two pulmonary veins (left and right) returning blood from the superior lobes of the lungs

No statement uses or specializes pulmonary_vein; click here to add one.