
Sinoatrial node - Wikipedia
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.
Sinoatrial node: definition, location, function - Kenhub
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.
Anatomy and Function of the Heart's Electrical System
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.
Conducting System of the Heart - SA Node - TeachMeAnatomy
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.
Physiology, Sinoatrial Node - StatPearls - NCBI Bookshelf
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 …
Heart Conduction System (Cardiac Conduction) - Cleveland Clinic
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.
Overview of Sinoatrial and Atrioventricular Heart Nodes
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.
The Central Brain of the Heart: The Sinoatrial Node - PMC
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.
Sinoatrial Node - an overview | ScienceDirect Topics
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.
Function and Dysfunction of Human Sinoatrial Node - PMC
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.
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