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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 of the right atrium made up of cells known as pacemaker cells. The sinus node is approximately 15 mm long, 3 mm wide, and 1 mm thick, located directly below and to the side of the superior vena ...
The sinoatrial node (SA node) is the primary pacemaker of the heart. It is a region of cardiac muscle on the wall of the upper right atrium near to the superior vena cava entrance. The cells that make up the SA node are specialized cardiomyocytes known as pacemaker cells that can spontaneously generate cardiac action potentials.
The sinoatrial node is located in the superior part of the crista terminalis at the junction of the right atrium, and superior vena cava. [2]: ...
The sinoatrial node (SA node) is located in the posterior aspect of the right atrium, next to the superior vena cava. This is a group of pacemaker cells which spontaneously depolarize to create an action potential.
Normally, the signal is generated at sinus node, also known as sinoatrial node, since it lies on the right atrial wall, near the orifice of superior vena cava. Usually, a rather large artery, named sinus artery, supplies the node. Various pathways initiate from sinus node, and carry the signal through the wall of both right and left atrium.
The funny current is highly expressed in spontaneously active cardiac regions, such as the sinoatrial node (SAN, the natural pacemaker region), the atrioventricular node (AVN) and the Purkinje fibres of conduction tissue. The funny current is a mixed sodium–potassium current that activates upon hyperpolarization at voltages in the diastolic ...
The origin of the sinoatrial node artery is not related to coronary artery dominance, which means the side (right or left) that provides the circulation to the back of the heart. In contrast, the atrioventricular nodal branch, that is the artery that brings blood to the atrioventricular node, depends on coronary artery dominance. [citation needed]
Located in the wall of the right atrium is a group of specialised cells, called the Sinoatrial node (SAN). These cells, unlike most other cells within the heart, can spontaneously produce action potentials. [5]