Canadian Medical Guide > Anatomy > Cardiovascular System > Heart > Heart Conduction System > Sinoatrial Node Terms and Definitions




Sinoatrial Node

Medical Definition: 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).

Sinoatrial Node Medical Definitions and Terms

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