Sinus


Sinusitis.

2. A channel permitting the passage of blood or lymph fluid that is not a blood or lymphatic vessel, such as the sinuses of the placenta.

3. A tract or fistula leading to a cavity which may be filled with pus.

The word was borrowed from the Latin noun “sinus,” which means “curve, fold, or hollow.” The same root gave rise to “sinuous”.

Read Also:

  • Sinus arrhythmia

    The normal increase in heart rate that occurs during inspiration (when you breathe in). This is a natural response and is more accentuated in children than adults. The “sinus” refers to the natural pacemaker of the heart which is called the sinoatrial (or sinus) node. It is located in the wall of the right atrium […]

  • Sinus barotrauma

    Sinus troubles, particularly with pain and a feeling of pressure, due to changing atmospheric pressures, as when going up or down in a plane. Also called aerosinusitis or barosinusitis.

  • Sinus bradycardia

    A regular but unusually slow heart beat (50 beats/minute or less at rest). Sinus bradycardia can be the result of many things including good physical fitness, medications, and some forms of heart block. “Sinus” refers to the sinus node, the heart’s natural pacemaker which creates the normal regular heartbeat. “Bradycardia” means that the heart rate […]

  • Sinus headache

    A headache caused by pressure within the sinus cavities of the head, usually in connection with sinus infection. The sufferer has pain and tenderness in the sinus area, discharge from the nose, and sometimes a swollen face. Treatment involves treating the underlying condition, which is often an allergy, and using nasal vasoconstrictors and analgesic medications.

  • Sinus node

    The sinus node is one of the major elements in the cardiac conduction system, the system that controls the heart rate. This stunningly designed system generates electrical impulses and conducts them throughout the muscle of the heart, stimulating the heart to contract and pump blood. The sinus node is the heart’s natural pacemaker. The sinus […]


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