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).
Nodus sinoatrialis
Node, Sinoatrial — Nodes, Sinoatrial — Sinoatrial Nodes — Sinu-Atrial Node — Node, Sinu-Atrial — Nodes, Sinu-Atrial — Sinu Atrial Node — Sinu-Atrial Nodes — Sinus Node — Node, Sinus — Nodes, Sinus — Sinus Nodes — Sino-Atrial Node — Node, Sino-Atrial — Nodes, Sino-Atrial — Sino Atrial Node — Sino-Atrial Nodes — Sinuatrial Node — Node, Sinuatrial — Nodes, Sinuatrial — Sinuatrial Nodes