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.

Oct 30, 2023 · The sinoatrial node, better known as the sinuatrial or SA node is the key structure responsible for the generation of a regular heartbeat and is therefore often referred to as the pacemaker of the heart.

An electrical stimulus is generated by the sinus node (also called the sinoatrial node, or SA node). This is a small mass of specialized tissue located in the right upper chamber (atria) of the heart.

Apr 24, 2023 · The sinoatrial (SA) node is a collection of specialised cells (pacemaker cells), and is located in the upper wall of the right atrium, at the junction where the superior vena cava enters. These pacemaker cells can spontaneously generate electrical impulses.

Oct 3, 2022 · The SA node, or the sinus node, represents a crescent-like cluster of myocytes divided by connective tissue, spreading over a few square millimeters. It is located at the junction of the crista terminalis in the upper wall of the right atrium and the opening of …

Your sinoatrial (SA) node is your heart’s natural pacemaker. It sends the electrical impulses that start your heartbeat. When your sinoatrial node isn’t working well, the lower segments of your conduction system act as backup pacemaker cells.

Jul 18, 2019 · The sinoatrial node, also referred to as the pacemaker of the heart, coordinates heart contractions. Located in the upper wall of the right atrium , it generates nerve impulses that travel throughout the heart wall causing both atria to contract.

Spontaneous action potentials generated by the pacemaker cells of the sinoatrial node (SA) node are the first step in the chain of events that comprise each cardiac cycle.

The sinoatrial node is the pacemaker of the heart and is located just to the right and anterior to the opening of the superior vena cava. The impulses are transmitted to the atrioventricular node through the wall of the atrium.

The sinoatrial node (SAN) automaticity is essential for maintaining normal cardiac function. Sick sinus syndrome is an abnormality involving the generation of the action potential by the SAN and is characterized by an atrial rate inappropriate for physiological requirements.