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sinus

1 of 1noun
/ˈsaɪ.nəs/
Forms:sinuses
1

an air-filled cavity, especially within the bones of the skull

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The sinus is a hollow space located in the facial bones of the skull. It is lined with a mucous membrane and serves various functions, such as producing mucus, reducing the weight of the skull, and enhancing the resonance of our voice. When the sinus becomes inflamed or congested, it can lead to sinusitis, which is characterized by symptoms like nasal congestion, facial pain, and headaches. Proper sinus health is important for maintaining clear breathing and overall well-being.

  • He suffered from inflammation of the maxillary sinus.
  • Sinus infections often cause pressure and headaches.
  • The frontal sinus is located above the eyes.
  • CT scans showed fluid buildup in the sinuses.
  • The ethmoid sinuses are small and numerous.
2

a wide blood channel that lacks the lining of a typical blood vessel

A sinus refers to a hollow space or cavity within a bone or tissue. Sinuses are typically lined with a mucous membrane and can be found in various locations, such as the skull, nasal passages, and facial bones. They serve several functions, including reducing the weight of the skull, enhancing voice resonance, producing mucus, and helping to regulate air pressure and temperature. Sinuses are prone to inflammation and can contribute to conditions such as sinusitis when their normal drainage becomes blocked.

  • The surgeon carefully examined the venous sinus during the procedure.
  • Sinuses in the liver help regulate blood flow.
  • The brain contains several large dural sinuses.
  • Venous sinuses collect blood from surrounding tissues.
  • Damage to a major sinus can lead to severe bleeding.
Synonyms:
venous sinus
3

an abnormal channel that drains a pus-filled cavity to the body surface

  • The patient developed a sinus from a dental abscess.
  • Chronic infection led to a sinus forming under the skin.
  • The doctor drained the sinus to prevent further infection.
  • Sinus tracts often require surgical intervention.
  • The abscess created a small sinus to the exterior.
Synonyms:
fistula