Sinus

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Sinus may refer to:

Anatomy[edit]

  • Sinus (anatomy), a sac or cavity in any organ or tissue
    • Paranasal sinuses, air cavities in the cranial bones, especially those near the nose, including:
      • Maxillary sinus, is the largest of the paranasal sinuses, under the eyes, in the maxillary bones
      • Frontal sinus, superior to the eyes, in the frontal bone, which forms the hard part of the forehead
      • Ethmoid sinus, formed from several discrete air cells within the ethmoid bone between the eyes and under the nose
      • Sphenoidal sinus, in the sphenoid bone at the center of the skull base under the pituitary gland
    • Anal sinuses, the furrows which separate the columns in the rectum
    • Dural venous sinuses, venous channels found between layers of dura mater in the brain
    • Sinus (botany), a space or indentation, usually on a leaf

Heart[edit]

Other uses[edit]

  • Sine, a trigonometric math function (Latin sinus)

See also[edit]

  • Sinus Medii, a small lunar mare
  • Sinus Successus, a lunar feature
  • Hemocoel, a space filled with hemolymph in organisms with open circulatory systems
  • Sines, a municipality in Alentejo, Portugal (Latin Sinus)
  • Sinusitis, a common ailment resulting in the inflammation of the paranasal sinuses