#venous_sinus__sinus__sinu  a wide channel containing blood; does not have the coating of an ordinary blood vessel
  supertype:  duct__canal__channel  a bodily passage or tube conveying a secretion or other substance
  subtype:  cavernous_sinus__sinus_cavernosus  either of a pair of large venous sinuses in the cranial cavity
  subtype:  coronary_sinus__sinus_coronarius  a short sinus receiving most of the veins of the heart; empties into the right atrium
  subtype:  sigmoid_sinus__sigmoidsinu__sinus_sigmoideus  an S-shaped dural sinus on the temporal and occipital bones
  subtype:  straight_sinus__tentorial_sinus__tentorialsinu__sinus_rectus  an unpaired sinus of the dura mater
  subtype:  transverse_sinus__sinus_transversus__sinustransversu  a paired dural sinus; terminates in the sigmoid sinus

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