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Sinus

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The word sinus has many medical and surgical meanings:

  • a hollow cavity within bone e.g. the paranasal sinuses of the skull - the sinuses the layperson most commonly refers to with respect to 'sinusitis'
  • a dilated blood vessel, usually for venous blood e.g. the dural sinuses of the skull
  • a dilatation, usually fusiform, in a tubular organ or tissue e.g. the carotid sinus, the sinus venosus of the embryonic heart
  • a passage, frequently infected, leading from the interior of the body to junction with a hollow viscus or the skin
  • an abbreviation for the sinoatrial node of the heart, giving rise to phrases such as sinus arrhythmia

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The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

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