Anatomy
sinuatrial node
Subclass of:
Cardiac conduction system
Definitions related to sinoatrial node:
  • (sinus node) A specialized group of heart cells in the right atrium that generate the electrical impulses that cause the heart muscle to contract. Also called the heart's natural pacemaker.
    Harvard Dictionary of Health Terms
    Harvard Medical Publishing, 2011
  • A cluster of specialized cells located in the upper area of the right atrium. These cells generate the electrical impulses that result in the normal sinus rhythm.
    NCI Thesaurus
    U.S. National Cancer Institute, 2021
  • (sinuatrial node) Subdivision of conducting system of heart at the junction of the right atrium and the superior vena cava, around the sinoatrial nodal branch of right coronary artery and is continuous with the internodal tract.
    Foundational Model of Anatomy
    University of Washington, 2017
  • The small mass of modified cardiac muscle fibers located at the junction of the superior vena cava (VENA CAVA, SUPERIOR) and right atrium. Contraction impulses probably start in this node, spread over the atrium (HEART ATRIUM) and are then transmitted by the atrioventricular bundle (BUNDLE OF HIS) to the ventricle (HEART VENTRICLE).
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2021
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