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Sinus may refer to:


In anatomy, a sinus is a cavity within a bone or other tissue. Most are commonly found in the bones of the face and connecting with the nasal cavities:

In the heart:

  • Sinus node, a structure in the superior part of the right atrium;
  • Sinus rhythm, normal beating on an ECG;
  • Coronary sinus, a vein collecting blood from the heart;
  • Sinus venosus, a cavity in the heart of embryos;
  • Sinus venarum, a part of the wall of the right atrium in adults, developed from the sinus venosus;


  • Sinus (botany), a space or indentation, usually on a leaf.
  • normal heart rate


  • Sine, a trigonometric math function (Latin sinus)


See also[edit]

  • Hemocoel, a space filled with hemolymph in organisms with open circulatory systems;
  • Sines, Portugal, a municipality in Alentejo (Latin Sinus);
  • Sinusitis, a common ailment resulting in the inflammation of the paranasal sinuses.