sinus node
noun Date: 1937 a small mass of tissue that is embedded in the musculature of the right atrium of higher vertebrates and that originates the impulses stimulating the heartbeat

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • 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 …   Medical dictionary

  • sinus node — noun : sinoatrial node * * * /suy neuhs/, Anat. See sinoatrial node. * * * sinus node, = sinoatrial node. (Cf. ↑sinoatrial node) …   Useful english dictionary

  • sinus node — /suy neuhs/, Anat. See sinoatrial node. * * * …   Universalium

  • sinus node — /ˈsaɪnəs noʊd/ (say suynuhs nohd) noun a dense network of specialised conduction fibres at the junction of the superior vena cava and the right atrium; normally originates the cardiac rhythm and has been called the pacemaker of the heart …   Australian English dictionary

  • sinus node reentrant tachycardia — sinus node reentry tachycardia, sinus reentrant tachycardia tachycardia arising from a reentrant circuit that encompasses the sinus node …   Medical dictionary

  • sinus node electrogram — an intracardiac electrogram obtained by placing electrodes near the sinus node; it is used in examining the time for impulse conduction from the node to the atrium …   Medical dictionary

  • Sinus — may refer to:In anatomy, where a sinus is a sac or cavity in any organ or tissue: *Sinus (anatomy), description of the general term *Anal sinuses, the furrows which separate the columns in the rectum *Paranasal sinuses, air cavities in the… …   Wikipedia

  • Node, sinus — 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 …   Medical dictionary

  • Sinus rhythm — The normal regular rhythm of the heart set by the natural pacemaker of the heart called the sinoatrial (or sinus) node. It is located in the wall of the right atrium (the right upper chamber of the heart). Normal cardiac impulses start there and… …   Medical dictionary

  • Sinus tachycardia — A fast heartbeat (tachycardia) because of rapid firing of the sinoatrial (sinus) node. The sinoatrial (or sinus) node is the natural pacemaker of the heart. It is located in the wall of the right atrium (the right upper chamber of the heart).… …   Medical dictionary

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