#ophthalmic_vein__vena_ophthalmica  either of two veins that serve the eye; empties into the cavernous sinus
  supertype:  #vein__vena  a blood vessel that carries blood from the capillaries toward the heart; all veins except the pulmonary carry unaerated blood
  subtype:  #inferior_ophthalmic_vein  a vein that drains a venous network in the floor and medial wall of the eye socket
  subtype:  #superior_ophthalmic_vein  a vein that begins at the inner angle of the eye socket and passes through the superior orbital fissure to empty into the cavernous sinus

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