sinus

1. An abnormal passage leading from a suppurating cavity to the body surface (synset 105555665)
   is a type of: passage, passageway - a path or channel or duct through or along which something may pass
   same as: fistula
2. Any of various air-filled cavities especially in the bones of the skull (synset 105260434)
   is a type of: bodily cavity, cavity, cavum - (anatomy) a natural hollow or sinus within the body
   subtypes:

   • ethmoid sinus, ethmoidal sinus, sinus ethmoidales - a sinus of the meatuses of the nasal cavity (behind the bridge of the nose)
   • frontal sinus - one of a pair of cavities in the frontal bone
   • maxillary sinus - one of a pair of sinuses forming a cavity in the maxilla
   • nasal sinus, paranasal sinus, sinus paranasales - any of the paired sinuses in the bones of the face adjacent to the nasal cavity that are lined with mucous membrane that is continuous with the lining of the nasal cavities
3. A wide channel containing blood;
   Does not have the coating of an ordinary blood vessel (synset 105259480)
   is a type of: canal, channel, duct, epithelial duct - a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance
   subtypes:

   • cavernous sinus, sinus cavernosus - either of a pair of large venous sinuses in the cranial cavity
   • coronary sinus, sinus coronarius - a short sinus receiving most of the veins of the heart; empties into the right atrium
   • sigmoid sinus, sinus sigmoideus - an S-shaped dural sinus on the temporal and occipital bones
   • sinus rectus, straight sinus, tentorial sinus - an unpaired sinus of the dura mater
   • sinus transversus, transverse sinus - a paired dural sinus; terminates in the sigmoid sinus
   same as: venous sinus

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