The sinoatrial node (also known as the sinuatrial node, SA node or sinus node) is an oval shaped region of special cardiac muscle in the upper back wall...

that is initiated in the sinoatrial node. The initial action impulse in a heart is usually formed in the sinoatrial node (SA node) and carried through the...

in SVT by most sources. Sinoatrial node reentrant tachycardia (SANRT) is caused by a reentry circuit localised to the SA node, resulting in a P-wave of...

hearts, these cells form the cardiac pacemaker and are found in the sinoatrial node in the right atrium. They produce roughly 60–100 action potentials...

Sinoatrial arrest is a medical condition wherein the sinoatrial node of the heart transiently ceases to generate the electrical impulses that normally...

at various levels: the sinoatrial node, the atrioventricular node, or damage to conduction tissue between or after these nodes. Bradycardia caused by...

produced by specialized pacemaker cells found within the sinoatrial node and the atrioventricular node. Cardiac muscle is composed of myocytes which initiate...

conduction system of the heart) transmits the signals generated by the sinoatrial node – the heart's pacemaker, to cause the heart muscle to contract, and...

blood cells Node of Ranvier, periodic gaps in the insulating myelin sheaths of myelinated axons Sinoatrial node and atrioventricular node, specialized...

with pacemaker cells in the sinoatrial node, spreads throughout the atrium, and passes through the atrioventricular node down into the bundle of His and...

The sinoatrial nodal artery, sinoatrial nodal artery or sinoatrial artery is an artery of the heart which supplies the sinoatrial node, the natural pacemaker...

cells in the sinoatrial node. These generate an electric current that causes the heart to contract, traveling through the atrioventricular node and along...

Conduction is initiated by the sinoatrial node ("sinus node" or "SA node"), and then travels to the atrioventricular node ("AV node") which also contains a secondary...

atrioventricular node (AV node), the "junction" between atria and ventricles. Under normal conditions, the heart's sinoatrial node(SA node) determines the...

sinoatrial node. Heart cells have the ability to generate electrical activity independent of external stimulation. As a result, the cells of the node...

Normally, the sinoatrial node (SA node) produces an electrical signal to control the heart rate. The signal travels from the SA node to the ventricles...

physiological pacemaker of the heart is the sinoatrial node. If the sinoatrial node is rendered dysfunctional, the AV node may act as the pacemaker. If both of...

conduction system (and AV node part of it) coordinates myocyte mechanical activity. A wave of excitation spreads out from the sinoatrial node through the atria...

venosus will develop into the posterior part of the right atrium, the sinoatrial node and the coronary sinus. The central part of cardiogenic area is in...

characterized by premature heartbeats originating in the atria. While the sinoatrial node typically regulates the heartbeat during normal sinus rhythm, PACs...

sinus node or sinoatrial node (SA node). The impulse initially causes both atria to contract, then activates the atrioventricular node (AV node), which...

conduction system to produce these impulses synthetically. The sinoatrial node (SA node) is the primary pacemaker of the heart. It is a region of cardiac...

of the sinoatrial node (SA node), and the vagus nerve provides parasympathetic input to the heart by releasing acetylcholine onto sinoatrial node cells...

portion (sinus venarum) of the internal surface of the right atrium. The sinoatrial node is located within the crista terminalis.: 56  The crista terminalis...

Sinus node dysfunction (SND), also known as sick sinus syndrome (SSS), is a group of abnormal heart rhythms (arrhythmias) usually caused by a malfunction...

the ventricles. These electrical pathways contain the sinoatrial node, the atrioventricular node, and the Purkinje fibers. (Exceptions such as accessory...

lowering of the heart rate. The right vagus branch innervates the sinoatrial node. In healthy people, parasympathetic tone from these sources is well-matched...

This is different from normal pacemaking activity, where the sinoatrial node (SA node) is responsible for each heartbeat and keeps a steady rate and...

the sinoatrial node (SA node) failing to initiate a beat, by a failure of the conductivity from the SA node to the atrioventricular node (AV node), or...

system include the atrial and ventricular syncytium, the sinoatrial node, the atrioventricular node, the bundle of His (atrioventricular bundle), the bundle...